What gear ratio do I have? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DBLSPRT68 · 03-22-2004, 02:03 PM

Hello, I'm doing a cab/bed swap from an 83 C-10 to an 82 C-20. I need to know the rear end ratio and if it's a l/s or posi. The 83 C-10 was a lwb, 305 cid, 700r4 with every option I believe. Here are the codes I got off the fwd side of the rr axel tube. TUM G034 1 Any help would be great! I have a factory shop manual but it dosen't tell me what the ratio would be. A fellow board member may buy the chassis from me. Thanks, David

**crossy** · 03-22-2004, 02:32 PM

the TUM code is a 2.73 open like 90% of the others from 81-86. DAVE

03-22-2004, 02:03 PM	#1
DBLSPRT68 Registered User Join Date: Nov 2000 Location: Ft. Mill, SC USA Posts: 931	What gear ratio do I have? Hello, I'm doing a cab/bed swap from an 83 C-10 to an 82 C-20. I need to know the rear end ratio and if it's a l/s or posi. The 83 C-10 was a lwb, 305 cid, 700r4 with every option I believe. Here are the codes I got off the fwd side of the rr axel tube. TUM G034 1 Any help would be great! I have a factory shop manual but it dosen't tell me what the ratio would be. A fellow board member may buy the chassis from me. Thanks, David __________________ PROJECT TRUCK: 1985 SWB C10 Silverado Black/Charcoal, 1990 V2500 Suburban, 2018 Suburban, 2005 GMC 2500HD CCSB, 2014 Toyota Camry SE, HAD.....1968 Camaro RS/SS Family owned since new; 350 3 speed SOLD

03-22-2004, 02:32 PM	#2
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	the TUM code is a 2.73 open like 90% of the others from 81-86. DAVE __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.



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