Cascade Crew

HONDASLAYER · Posted: Sun Mar 29, 2009 7:52 pm Post subject: 88+ electronic speedo

i just installed my new t5. but my old one was a mechanical speedo and the new one is an electric one out of an 88 firebird. so i need an electric speedo including everything from the gauge to the tranny plug.
Please pm me with what you've got and how much

rjmcgee · The Hammer Joined: 08 Jan 2004 Posts: 2328

Pull the speed sensor out of the new transmission and put the cable speedo drive from the old transmission in. Hook your speedometer cable back up and your done. The transmission cases are the same for either speedo.

I did the opposite when I put the T5 out of an 83 into an 87 Firebird. Plus you should be able to get a few bucks out of the electric speed sensor as they are hard to find.

HONDASLAYER · Posted: Sun Mar 29, 2009 8:13 pm Post subject:

we were going to do that but when we looked at the little gear on the electric speedo it was bigger than the other one and with a drifferent angle to the teeth. so we desided not to.

aaron_sK · Posted: Sun Mar 29, 2009 10:24 pm Post subject:

You're probably gonna have to change the speedo gear anyway, unless the car you got your news trans out of had the same rear gears.

Twilightoptics · Posted: Mon Mar 30, 2009 6:24 am Post subject:

Do what Rod said. Use your Bullet from the old T5 and put it on the new. Camaro's didn't go electricspeedo until 1990 and the entire dash is different. So you can't just swap in a different speedometer.

All the F-body T5's I've see have a blue 7 tooth gear on the mainshaft. Even the VSS ones. You should be able to just put your old bullet and driven gear in.

aaron_sK · Posted: Mon Mar 30, 2009 9:49 am Post subject:

Twilightoptics · Posted: Mon Mar 30, 2009 10:56 am Post subject:

blue89 · Posted: Mon Mar 30, 2009 1:15 pm Post subject:

The S10's used the same transmission, just had the shifter in a different spot?

Quasi-Traction · Posted: Mon Mar 30, 2009 2:35 pm Post subject:

TH-350 uses the same "bullet" that houses the trans gear for the T-5 also FYI.

I'm not 100% if the TH-400 does too, but since they're pretty similar I would assume so.

Hondaslayer, do you know what your rear gear ratio is?

Go here: http://www.bgsoflex.com/speedo1.html

Then here: http://www.cascadecrew.org/phpBB2/viewtopic.php?t=5194

Once you know your ring/pinion, tire size , and the size of your gear on the main shaft of the transmission, you can figure the correct speedometer gear to get.

HONDASLAYER · Posted: Mon Mar 30, 2009 3:01 pm Post subject:

Twilightoptics · Posted: Mon Mar 30, 2009 3:35 pm Post subject:

He needs to reuse the speedo gear that came out of the original transmission.

End of story.

Travis, The S-10's had T5's as did the 5.0L Mustanges, Chevettes, and several other cars.

F-Body T5's are clocked at something like a 12º Counter Clockwise rotation. The tail is modified to accept a flat crossmember (trans mount is clocked 12º clockwise on trans to make up the difference). This is all done to move the shifter stickout closer to the driver allowing space for the e-brake handle.

DBL_TKE · Posted: Mon Mar 30, 2009 5:09 pm Post subject:

I thought that basically all the T-5's are all similar in name only?

Twilightoptics · Posted: Mon Mar 30, 2009 6:38 pm Post subject: