What gear is in my '71? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**GAc10boy** · 01-03-2014, 10:33 PM

My truck is a base model, originally 6 cylinder, 3 OTT truck. 1/2 ton SWB. For some reason I'm thinking it has a 4.11 but wanted to bring it to the pros. What say you?

It has a TH350 tranny and I'm thinking I'll keep it (once I confirm it's mechanically sound) and run a higher gear for highway speeds.

Shyguy · 01-03-2014, 10:54 PM

Probably 3.73 gears were stock unless listed different on the SPID. I am sure others will post more information.

**GAc10boy** · 01-03-2014, 11:09 PM

Quote:

Originally Posted by Shyguy

Probably 3.73 gears were stock unless listed different on the SPID. I am sure others will post more information.

Nothing on the SPID. 3.73 would be nice with a 200/700r4. Hmmmmm!

Won't a 200r4 bolt up relatively easy to the existing th350 crossmember and driveshaft length?

**LockDoc** · 01-04-2014, 12:48 AM

-
You can see if this thread will help. See post #8 for the possible code # location depending on what type of rear you have.

http://67-72chevytrucks.com/vboard/s...d.php?t=578793

LockDoc

01-03-2014, 10:33 PM	#1
GAc10boy Senior Member Join Date: Oct 2013 Location: Marietta, GA Posts: 1,642	What gear is in my '71? My truck is a base model, originally 6 cylinder, 3 OTT truck. 1/2 ton SWB. For some reason I'm thinking it has a 4.11 but wanted to bring it to the pros. What say you? It has a TH350 tranny and I'm thinking I'll keep it (once I confirm it's mechanically sound) and run a higher gear for highway speeds. __________________ - Robbie UNITED BY TRUCKS - classic truck video content YouTube: www.youtube.com/c/unitedbytrucks Instagram: @united_by_trucks Paw Paw '68 508 Dark Blue Custom C10 Teddy '68 GMC SWB 503 Light Green LS Build Mississippi Mud '75 Skyline Blue Patina SBC Build

01-03-2014, 10:54 PM	#2
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: What gear is in my '71? Probably 3.73 gears were stock unless listed different on the SPID. I am sure others will post more information. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

01-04-2014, 12:48 AM	#4
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,656	Re: What gear is in my '71? - You can see if this thread will help. See post #8 for the possible code # location depending on what type of rear you have. http://67-72chevytrucks.com/vboard/s...d.php?t=578793 LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

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