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?

 

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?

 

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.

 

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.

 

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

http://www.tpiparts.net/inc/sdetail/7587

 

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

http://www.tpiparts.net/inc/sdetail/7587

 

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.