Fig. 43 · GM hub

GM transmission repair & rebuild.

Silverado, Suburban, Tahoe, Yukon, Sierra, Escalade. 6L80, 8L90, 10L80, 4L60E.

Make-specific rebuild

Every GM I’ve had on the bench.

Silverado 1500 to 3500. Tahoe, Suburban, Yukon, Sierra. Cadillac Escalade. If it’s got a 6L80, 8L90, 10L80, or the old 4L60E, I’ve had it apart, and I know what they break first.

The 8L90 is a rough-shifting beast out of the factory. Valve-body and TCC issues all over the forums. I’ve rebuilt enough of them to know the fix isn’t more software. It’s a proper valve body repair with Sonnax parts.

Chevy Silverado on a rural Florida road
Mechanic hands on a 6L80 valve body at the bench

FIG. 01 · GM 6L80 valve body on the bench, 2014 Silverado 1500

★★★★★

If I could give 10 stars I would.. My transmission in my handicap equipped. Suburban went got it to Anthony's shop. He changed his schedule around for me and managed to get me back on the road

Brian Mathews 4 months ago
★★★★★

Anthony and Jamie were amazing, great mechanics with great advice. They'll help you with just about anything you need and they're honest. Built a new transmission for my Chevy Blazer and it runs better than ever now!

Chris Newell 4 months ago
★★★★★

Anthony is a great guy! He rebuilt the transmission in my 07 Cadillac Escalade. Had it done properly and professionally, in a matter of a few days. I definitely recommend this man's business any day of the week

andrew points 5 months ago
★★★★★

Did an amazing job rebuilding my suburban. Quick turn around time and Anthony was very good with communicating with me the whole time during the process. Highly recommend

Morgan Letchworth 3 months ago

What GM owners ask me

Before you call.

My 8L90 shifts hard. Is that normal?

It’s common, but no, it’s not okay. The 8L90 responds to a Sonnax valve-body fix and a TCC clutch job. If GM’s recalibrations didn’t solve it, the hardware needs help.

Can I tow with a rebuilt 4L60E?

Yes. But do an HD build. Upgraded clutch stack, extra cooler, beefier sunshell. Runs forever on a towing Suburban.

Call the shop

(352) 232-8364

Rings on my hip. – Anthony

Road-tested by Spring Hill Transmission