2sp to turbo700 swap - Impala Tech
Transmission & Driveline Transmissions & Differentials

 
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post #1 of 20 (permalink) Old 01-15-2016, 04:47 PM Thread Starter
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2sp to turbo700 swap

Hi guys I have a 2sp and would like to change it to turbo 700 when I put my 327 back in my impala what would I need to change and swap over.

does the cross member need to be change and can you buy one made
also tail shift does that need to be made small cause the turbo 700 is bigger I see you can buy the console parts for the shifter so that all good there.

thanks.
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post #2 of 20 (permalink) Old 01-15-2016, 06:54 PM
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Depends upon the year of your car.

The 700R4 is physically longer than the PowerGlide so you will need to cut down the overall length of your drive shaft. The mounting point that the tranny bolts up to is also located further back that the PG, so depending upon your car body you either move the old cross-member back and drill new bolt holes in the frame rails or buy a fabricated transmission cross-member to fit your 700R4 in your car.

The transmission uses metric nut and bolts as well as it's tube size so you will need an adapter to splice the two hydraulic lines together (this assuming your PowerGllide isn't an earlier air cooled one without hydraulic lines going to your radiator). The gear selector linkage works as far as the bell crank under the car. It needs to be lengthened if you expect to select all of the gears manually.

Otherwise it will work as is giving you just P N and Dive. To access OD you have to either wire in a switch to flip it into OD, or use a hydraulic switch that will toggle the OD when it sees a preset pressure in high gear. You tie into the brake pedal switch to turn OD off.

The new lock-up torque converter bolts to a metric flex plate that is drilled for a smaller one piece rear main seal so you will need to buy an aftermarket SFI approved flex plate to bolt the new torque converter to your older two piece rear main seal crank flange.

Big Dave
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post #3 of 20 (permalink) Old 01-16-2016, 08:56 AM
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What year of Impala ????OK I'll try and help as I am just putting the finishing touches on this swap in my 63 . .AS Dave said it is longer trans cross member will need moved back I made my own, various vendors have a complete kit or just the cross member for this swap. I like to fab my own stuff when I can , trans cooling lines were a direct swap just a little bending , 700 has a different tail shaft yoke you need 1 for your trans either a 27 or 20 spline depending on what year trans you get. There is a seam (lip) where your floor board meets the firewall it needs trimmed alittle where the dipstick comes up it will interfere and rub . Depending on the year of trans you will need to swap your speedometer gears over to manual, the newer ones went to electric . Shift linkage will need altered to get the gears to work properly. Allso the driveshaft will need cut about 3" I am going to a 1 piece driveshaft and eliminate the center carrier another option to look at. And then you need the TV cable which is the most important part when your ready to drive set it right or smoke your trans . Like I said there are some vendors out there that offer a complete kit for this which would save time but I don't have the funds $$ for this so I fabbed my own stuff up .Good Luck
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post #4 of 20 (permalink) Old 01-16-2016, 06:30 PM Thread Starter
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Morning guys car is a 66 ss impala if that help.
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post #5 of 20 (permalink) Old 01-16-2016, 07:51 PM
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It helps you as the there is more room under the car and between the frame rails. No two piece drive shaft to worry about or small 20 spine PowerGlide output shaft. Your PowerGlide uses the same output yoke as the 700R4. I'm sorry I forgot to mention the TV cable all together. It is important to adjust it correctly as it controls the line pressure applied to the clutches and drums. Out of adjustment and everything burns up in a mater of minutes.

There are actual conversion kits put together by many vendors that will have everything you need with instructions in one box.

Ecklers lists all of the parts starting with a cross-member:

http://www.lategreatchevy.com/full-s...1965-1975.html

Chevy lock-up pressure switch, 700R4 Transmission:

http://www.lategreatchevy.com/full-s...1958-1972.html

Turbo Hydra-Matic 700R4 (TH700R4), With Stock Lock-up Torque Converter:

http://www.lategreatchevy.com/full-s...1958-1972.html

Powerglide To 4-Speed Automatic Transmission Shifter Conversion Kit:

http://www.lategreatchevy.com/full-s...1965-1967.html

Chevy Transmission To Radiator Metric O-Ring Cooling Line Adapters:

http://www.lategreatchevy.com/full-s...1958-1972.html

These may not be needed it depends upon the year of the donor transmission. The 700R4 from it's introduction in 1984 was improved annually. The yearly changes made the transmission stronger every year. The newer the better up to the introduction of the 4L60e transmission which is a 700R4 renamed and more importantly computer controlled instead of using the hydraulics in the valve body to shift the tranny. Even some 4L65e parts are still backward compatible with an older 700R4 and high performance transmission shops will rebuild a 700R4 using those parts (even so the Sun Shell is still weak and will snap off if any serious torque such as from a 502 cube BBC is applied).

Detent Bracket, For Cars With Carburetor

http://www.lategreatchevy.com/full-s...1958-1972.html



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post #6 of 20 (permalink) Old 02-21-2016, 07:35 PM
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I bought some of the conversion stuff when I did my 1967 PG to 700R4 from Bowtie Overdrivers in CA. Good parts that have worked well for a number of years now.
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post #7 of 20 (permalink) Old 02-28-2016, 05:12 AM Thread Starter
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guys trans is out of a 91 holden commodore here in Australia and was behind a 5ltr v8 car. also how do I make the speedo work once the trans is in. cheers
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post #8 of 20 (permalink) Old 02-28-2016, 08:59 AM
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That one has an electric sending unit.

The way I did it for one car was to buy a $700 electric motor that takes the digital input and syncs a DC motor to the correct RPM by varying the voltage to the motor. Basically the missing computer is in the case with the motor bolted under the car along with the drive motor.

Another cheaper possibility that I used after that fiasco was to buy an electric speedometer to match my Tach from Auto-meter (Both had the black five inch Sport Comp face for day light driving). This worked out fine for me as I place all of the important gauges on top of the dash in my line of sight due to my size (my head is touching the head liner and my eye line is just below the sun visors so I get the advantage of built in sun glasses due to the extra dark tint at the top of the windscreen as I drive).

If you are not 6'-6'' then you might have to build a custom dash to place your gauges in to the dash which is how a mod on another board did it with his Nova and if you had a Camaro there are aftermarket dashes sold to accept Auto-meter gauges. With an Impala you are on your own; and you will need to go the custom route. This will be a pain in most years as the gauges in the original dash are linear instead of round to simulate a sports car.

The proper solution is to find and earlier year transmission that has a mechanical gear set and buy the tail housing off of it. Then buy a new set of speedometer gears to match your rear end ratio from these guys who also sell tail housings ready to go (all cleaned up used ones). These guys web site also has a calculator that you punch in your rear gear ratio and they tell you the proper colored gears to buy, or you can call them on the phone and talk to them if you don't mind staying up all night as they are very helpful even if they half way around the world from where you live.

http://www.transmissioncenter.net

Big Dave
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post #9 of 20 (permalink) Old 03-05-2016, 01:39 AM Thread Starter
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big dave whats the Pressure Switch for and why do I need to change it cheers
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post #10 of 20 (permalink) Old 03-05-2016, 12:11 PM
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Don't know which switch you are talking about. The 700R4 and the 200R4 both use a pressure switch that measures the hydraulic line pressure that feeds the OD piston to engage the clutch that limits the slip in the torque converter. You need to install a second wire to your brake light switch to disengage the lock up feature whenever you try and stop the car.

The valve body is a just collection of pressure switches that controls the transmission based upon gear selector position, governor weights and springs as well as check balls (one way valves) to control the transmissions operation instead of a computer. So I am not sure which pressure valve you are talking about. I'm no transmission guy I have to get the Service manual out to rebuild one, though I have done it several times (they are not that complex to repair just requiring three special tools that cost about the same as you would pay someone else in labor to fix yours).

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post #11 of 20 (permalink) Old 07-20-2016, 05:01 AM Thread Starter
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Hi dave is this the wiring harness that I need to used to wire it back to the brake peddle buddy. cheers


or do I used the bowtie overdrive setup pic tcc-bosch
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Last edited by pacey; 07-20-2016 at 05:32 AM.
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post #12 of 20 (permalink) Old 07-20-2016, 09:36 AM
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The one on the left is for out side the case to turn it on and off. The one on the right goes inside the case (it should already be there now). You would only buy that if the one inside the case is missing or broken.

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post #13 of 20 (permalink) Old 07-21-2016, 02:41 PM Thread Starter
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Quote:
Originally Posted by Big Dave View Post
The one on the left is for out side the case to turn it on and off. The one on the right goes inside the case (it should already be there now). You would only buy that if the one inside the case is missing or broken.

Big Dave
Dave cant run the one on the left as my transmission does not have the plug for the switch so am going to buy the right. been talking to bowtie overdrive and they have told me what I need to do cheers.
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post #14 of 20 (permalink) Old 08-22-2016, 08:34 AM Thread Starter
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Hi guys I have done the swap and everything worked out ok just need to get the drive shaft made
but can any one tell me if you can buy a shaft/linkage rod for the t-bar to select gears or any picture of one so I can see the bend
so I can make one. cheers
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post #15 of 20 (permalink) Old 08-22-2016, 09:31 AM
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I have never seen pictures but the linkage rods are available along with either a decal or a new lens to show all of the gears on the steering column. You will have to search on line to find the parts you need as the lens or decal differs by year of car.

Big Dave
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post #16 of 20 (permalink) Old 08-25-2016, 07:28 AM Thread Starter
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linkage shift rod

Quote:
Originally Posted by lovebohn View Post
I bought some of the conversion stuff when I did my 1967 PG to 700R4 from Bowtie Overdrivers in CA. Good parts that have worked well for a number of years now.


hi buddy do you have a pic of the linkage rod for the 700r my one is floor shirt t-bar. as I need to make one.


cheers
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post #17 of 20 (permalink) Old 08-25-2016, 08:28 AM
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Most aftermarket floor shifters use a universal cable (one length fits all transmissions). The only thing that is application specific is the bracket that bolts to the tranny to make the shifter work with a cable.

Big Dave
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post #18 of 20 (permalink) Old 09-02-2016, 10:04 AM Thread Starter
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oil pan

Quote:
Originally Posted by Big Dave View Post
Most aftermarket floor shifters use a universal cable (one length fits all transmissions). The only thing that is application specific is the bracket that bolts to the tranny to make the shifter work with a cable.

Big Dave


hi guys transmission in and ran nice just one more quick question can you buy a different filter from factory spec for a deep pan for a 700r


cheers
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post #19 of 20 (permalink) Old 09-02-2016, 11:26 AM
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Yes TCI and B&M sell a deep pan with a filter adapter to lower it.

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post #20 of 20 (permalink) Old 01-05-2017, 10:37 AM
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Quote:
Originally Posted by pacey View Post
hi buddy do you have a pic of the linkage rod for the 700r my one is floor shirt t-bar. as I need to make one.


cheers
Sorry never got the notice of your question on email. I would look at the bowtie overdrive site. I got all of the stuff from them, if you still need a picture let me know.

Also my setup is a column shift not from the floor.
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