Welcome to BET

Home of G80 and GM transmission engineering

Transmission tools and components

Specializing in GM servos, transmission rebuild tools and other parts. Need a drop in billet servo for a 700-R4 or 4L60E series?  We have what you need.

Upgrade your 700R4, 4L60, 4L60E or 4L65E with an increased hold servo!

G80’s and other POSI units

We also offer a GM locking differential, posi-traction carrier rebuild service.  We can repair your original G80 unit, so your carrier shimming will not change.

Send us your core for evaluation or purchase a rebuilt differential from our online store at a fraction of the cost of a new one.

We buy differential cores! Do you have a retired Gov-Loc or other differential in your garage?

We’ll pay $75 for a rebuildable unit, contact us for more information.