Transmissions and Drivetrain Need help with your trans? Problems with your axle?

700r4 to T5 speed "O" issues

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Old Apr 30, 2014 | 06:58 AM
  #1  
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From: pnw near portland or.
Car: 91 RS convertible
Engine: 330 hp vortec 350. TBI
Transmission: 5 Speed
Axle/Gears: 3.73 Moiser 12 bolt/Wilwood disc's
700r4 to T5 speed "O" issues

Like the title says I have decided to stop trying to make my 700r4 work like I want it to and just put in a 5 speed. The issue is I have a 91 with an electronic speed 'o'. Is it as simple as just transfering it from the auto to the manual? Oh and I want the speed 'o' drive gears rite too. Something I couldn't do with that 700r4.

Sorry this is a new relm for me. Needless to say someone if I get rid of it will get a very expencive cheep trans. I have done everything to that thing several times. I could have put a 6 speed in it for what I have into that 700r4. But a 5 speed out of an 85 305 will have to do. I am giving it one chance to work. I am going with a middle of the road clutch for now to see if I like it.

I am getting excited to start work but it is finialy summer and it is a convertible and it is made to drive so maybe I'll do it this winter.
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Old Apr 30, 2014 | 07:32 AM
  #2  
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From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 700r4 to T5 speed "O" issues

You will need new gears. A 7 tooth drive gear that can be hard to find PN 14071731 and I forget what VSS gear you need for 3.73 but I know it is even harder to find.

When my friend did a similar swap he used a cable speedo gear PN 3987921 for his 3.73 then used a converter I think it was this one

http://tpiparts.net/inc/sdetail/7586

Last edited by midias; Apr 30, 2014 at 07:35 AM.
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Old Apr 30, 2014 | 07:09 PM
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Car: 87 IROC-Z28
Engine: 305 TPI-New 355 on the engine stand
Transmission: T56
Axle/Gears: 3.73 Eaton posi-Soon a 9" Ford!
Re: 700r4 to T5 speed "O" issues

The 7 tooth drive gears are available.

https://www.thirdgen.org/forums/engi...7-9-tooth.html
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Old May 4, 2014 | 01:36 PM
  #4  
gregl316's Avatar
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From: pnw near portland or.
Car: 91 RS convertible
Engine: 330 hp vortec 350. TBI
Transmission: 5 Speed
Axle/Gears: 3.73 Moiser 12 bolt/Wilwood disc's
Re: 700r4 to T5 speed "O" issues

Sell me what I need. I have 3'73 gears and 275/40's
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Old May 4, 2014 | 01:50 PM
  #5  
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From: Vancouver, WA
Car: 87 IROC-Z28
Engine: 305 TPI-New 355 on the engine stand
Transmission: T56
Axle/Gears: 3.73 Eaton posi-Soon a 9" Ford!
Re: 700r4 to T5 speed "O" issues

If you have 16" wheels you need a 7 drive and 21 driven.

For 17" and 18" tires you will need a 7 drive and 20 driven.

These are for a T5 only.
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Old May 24, 2014 | 04:07 PM
  #6  
gregl316's Avatar
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From: pnw near portland or.
Car: 91 RS convertible
Engine: 330 hp vortec 350. TBI
Transmission: 5 Speed
Axle/Gears: 3.73 Moiser 12 bolt/Wilwood disc's
Re: 700r4 to T5 speed "O" issues

I have Blue drive gear and a 19 driven.
I have 3.73 rear end and 275/40/18 tires do I need 20 driven?
What about the electronic speed sensor will that just bolt up?
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Old May 25, 2014 | 09:07 PM
  #7  
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From: Vancouver, WA
Car: 87 IROC-Z28
Engine: 305 TPI-New 355 on the engine stand
Transmission: T56
Axle/Gears: 3.73 Eaton posi-Soon a 9" Ford!
Re: 700r4 to T5 speed "O" issues

Yes a 7 tooth drive and a 20 driven. If you have a cable drive T5 then yes a stock 3rd gen VSS will bolt up, but you have no choice on driven gears for a VSS. What you have on your VSS is it, the driven gears for them are discontinued.

Last edited by alloy; May 25, 2014 at 09:11 PM.
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Old May 27, 2014 | 01:01 AM
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From: pnw near portland or.
Car: 91 RS convertible
Engine: 330 hp vortec 350. TBI
Transmission: 5 Speed
Axle/Gears: 3.73 Moiser 12 bolt/Wilwood disc's
Re: 700r4 to T5 speed "O" issues

So the VSS off my 700r4 will work on the T5?
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Old May 27, 2014 | 09:33 AM
  #9  
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From: Vancouver, WA
Car: 87 IROC-Z28
Engine: 305 TPI-New 355 on the engine stand
Transmission: T56
Axle/Gears: 3.73 Eaton posi-Soon a 9" Ford!
Re: 700r4 to T5 speed "O" issues

I'm not sure, post a picture of your VSS.
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Old Jun 12, 2014 | 11:35 AM
  #10  
gregl316's Avatar
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Joined: Aug 2003
Posts: 506
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From: pnw near portland or.
Car: 91 RS convertible
Engine: 330 hp vortec 350. TBI
Transmission: 5 Speed
Axle/Gears: 3.73 Moiser 12 bolt/Wilwood disc's
Re: 700r4 to T5 speed "O" issues

It is at the shop. If it doesn't work where can I get one? I also need the gears for the speed'o'.
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Old Jun 16, 2014 | 02:37 PM
  #11  
gregl316's Avatar
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Joined: Aug 2003
Posts: 506
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From: pnw near portland or.
Car: 91 RS convertible
Engine: 330 hp vortec 350. TBI
Transmission: 5 Speed
Axle/Gears: 3.73 Moiser 12 bolt/Wilwood disc's
Re: 700r4 to T5 speed "O" issues

I Found a place that makes a system that screws into the exsisting speedo.

Now I need the rite gears..

I have a 3.73 ratio with 275/40/18's. The drive gear is blue.
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