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Th350 speedo question

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Old 04-06-2012, 03:11 AM
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Th350 speedo question

I've got a 92 T/A 305tpi 5 speed. Im puttin a MUCH stronger motor in it so im doin a th350 swap. Now my question is, how do I make my electric speedo work with this swap?
Old 04-06-2012, 04:02 AM
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jmd
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Re: Th350 speedo question

Make sure the TH350 has a Chevy tailhousing with 1" speedo gear hole.
Use a crossmember that mounts the front end of the torque arm off the transmission.
Swap your speedo gears over to the TH350.
Done.
Old 04-06-2012, 07:41 AM
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Re: Th350 speedo question

Originally Posted by jmd
Make sure the TH350 has a Chevy tailhousing with 1" speedo gear hole.
Use a crossmember that mounts the front end of the torque arm off the transmission.
Swap your speedo gears over to the TH350.
Done.
Ok I understand the tailshaft part but the torque arm part is a little hazy. Doesn't it mount to the tailshaft?
Old 04-06-2012, 09:14 PM
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Car: 87 camaro
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Re: Th350 speedo question

you have to buy a b&m adapter that bolts to the th350 tailshaft and has a bracket for the torque arm. If your new engine is around 500+ hp I would not go that route because i dont think the adapter is made to hold that much power.

Another option is to buy a kit that eliminates mounting it to the trans. It comes with a new torque arm and a bracket/crossmember that mounts it to the front subframe. Costs alot more but is alot stronger.
Old 04-06-2012, 09:26 PM
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Re: Th350 speedo question

to my knowledge there is no th350 with a elec. speedo. so youll have to get a adapter that converts a mechanical speedo trans to elec speedo gauge. Its been awhile since i looked at them last but i kinda remember them being priced high.
Old 04-06-2012, 09:26 PM
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Re: Th350 speedo question

If your still using the sd ecm as a buffer 1227730 use this

http://www.tpiparts.net/inc/sdetail/7587
Old 04-06-2012, 09:27 PM
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Re: Th350 speedo question

If your still using the sd ecm as a buffer 1227730 use this

http://www.tpiparts.net/inc/sdetail/7587
Old 04-07-2012, 10:19 AM
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Car: 1992 WS6 T/A
Engine: Turbo 383 with Holley Sniper
Transmission: factory 5 speed now Powerglide
Axle/Gears: Strange 12 bolt w/373 locker
Re: Th350 speedo question

Originally Posted by krisner89
you have to buy a b&m adapter that bolts to the th350 tailshaft and has a bracket for the torque arm. If your new engine is around 500+ hp I would not go that route because i dont think the adapter is made to hold that much power.

Another option is to buy a kit that eliminates mounting it to the trans. It comes with a new torque arm and a bracket/crossmember that mounts it to the front subframe. Costs alot more but is alot stronger.
My trans already has a tailshaft with the torque arm mount. I think it will be ok. But if not ill look into the sub frame mount. Thanks for the info.
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