Help IDing Richmond Gear 4 spd tranny?
 

I thought my '78 L82 had the Borg Warner Super T10 in it. However, upon closer examination it's a Richmond Gear tranny. Does anyone know how to ID the R-G's? Close ratio vs. Wide ratio? I assume it's their SuperT10 but they also make a T10 Plus. According to their site the Plus is a heavy duty version for racing. Some letters/numbers on the left side of my casing say "JH02439" and underneath are a larger "70" if that helps.

in the car or out?

The old, pre 83 T10s are IDed by grooves on the input shaft.
Richmond stamps a SN on the top front or rear of the main case of their 5 and 6 speeds. Have you looked there?
Cast numbers are typically the part number (ie case), stamped numbers are the trans model.

Thank you! It's definitely a 4 spd. The car's at my friend's garage so ai won't get a chance to check it out until Monday. The cast numbers are the one's on the side of the case and I'll check the stamped numbers when I get a chance on Monday. Much appreciated!

It's in the car.

My Richmond super T10 has 5 circumferential grooves in the 26 spline input shaft...2.88:1 first gear ratio.

Thanks! I think the first gear on the BW Super T10 close ratio (that originally came with the car) had a 2.64 first gear. Richmond apparently had lots of options for WR and CR.

Iron case or aluminum?

Aluminum I believe.

Original BW close ratio in 78 was 2.43 in the L82
wide was 2.64 in the L82

L48 got the Muncie 2.85

You're right, my bad. The original was a close ratio in my car. Not sure (yet) what I've got in mine. I sent off an e-mail to Richmond Gear to see if they can assist in the mystery.

I hope you translated to Chinese before sending.:rofl:
From your original post, it sounds like you think yours is an aftermarket Richmond T10.
Like I said earlier, the OEM trans were IDed by input shaft groove.
Info here on that:
http://pontiacpower.org/BW.htm
If you could possibly see the top front flange of the trans, where it bolt to the bell, that's where Richmond stamps the number on their 5 and 6 speeds. I suspect they do the same on their 4 speeds.
You probably should be able to figure the gear ratio from the possible Richmond ratios below by just cranking the engine over by hand in 1st gear and checking the driveshaft revolution number. Or by a speed/rpm calculation.
http://www.richmondgear.com/pdf/UPGR..._MANUAL_v2.pdf

a Muncie with a 2.85 1st gear? never seen one of those

Thank you! I should get a chance on Mon. or Tues. to check out the case more closely. I'll also check out the link. Much appreciated!

Look for a number stamped into an area near the reverse shaft,
then head over to the Richmond website.

Thanks, I'll check.

I got a very prompt reply from Richmond Gear today. Apparently from the initial numbers I supplied they can identify it as one of their close ratio Super T10's with a 2.43 first gear. I'm a VERY happy camper!