Power steering gearbox 2wd vs 4wd and difference?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Gene · 04-07-2011, 09:41 PM

My gearbox took a crap on me and I was wondering if there were any difference other than the pittman arm? My local salvage has plenty of 2wd box's but no 4wd's.

**FRENCHBLUE72** · 04-07-2011, 10:01 PM

Im not sure if the pitman arm can be clocked or not but the 2wd swings side to side and the 4wd swings front to back.. You can however use the 2wd box and performa crossover steering set-up...

Gene · 04-07-2011, 10:25 PM

Quote:

Originally Posted by FRENCHBLUE72

Im not sure if the pitman arm can be clocked or not but the 2wd swings side to side and the 4wd swings front to back.. You can however use the 2wd box and performa crossover steering set-up...

I've heard of crossover, what all is involved in that setup?

Beelzeburb · 04-08-2011, 01:14 AM

Boxes and pitman arms are different between 2wd and 4wd. On the 4x4 box and arm they are splined on about 1/4 of the surface vs. being fully splined all the way around on the 2wd units.
If you want to learn about crossover steering I'd suggest a google search along the lines of "chevy crossover steering". ORD has some good info and products for instance.

RPBurris · 04-08-2011, 02:00 PM

http://www.autozone.com/autozone/par...21546_0_12266_

Here is a kit for $45 for Autozone. My gear box is leaky to and am thinking of rebuilding it before it craps out. New gear boxes are crazy expensive. A used one is a gamble.

I have also heard (but never verified) that 4wd boxes are a reverse rotation due to the location of the pitman arm.

**Classic Heartbeat** · 04-08-2011, 02:15 PM

The pitman shaft on a 2 wheel drice steering gear is both tapered and splined all of the way around, with spline seperation on them so that the pitman arm will only go on one way. The pitman shaft is also threaded on the end for a bolt that holds the pitman arm in place.

The 4 wheel drive steering gear has a pitman shaft that is not tapered. However it does have a short spline section, and a groove cut in it to alow for the bolt to pas thru tightening the pitman arm.
They are not interchangeable. WES

04-07-2011, 09:41 PM	#1
Gene Registered User Join Date: Aug 2002 Location: Muskogee, Oklahoma Posts: 2,914	Power steering gearbox 2wd vs 4wd and difference?? My gearbox took a crap on me and I was wondering if there were any difference other than the pittman arm? My local salvage has plenty of 2wd box's but no 4wd's.

04-07-2011, 10:01 PM	#2
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,601	Re: Power steering gearbox 2wd vs 4wd and difference?? Im not sure if the pitman arm can be clocked or not but the 2wd swings side to side and the 4wd swings front to back.. You can however use the 2wd box and performa crossover steering set-up... __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

04-08-2011, 01:14 AM	#4
Beelzeburb Devil's in the Details Join Date: Sep 2008 Location: Southern Utah Posts: 353	Re: Power steering gearbox 2wd vs 4wd and difference?? Boxes and pitman arms are different between 2wd and 4wd. On the 4x4 box and arm they are splined on about 1/4 of the surface vs. being fully splined all the way around on the 2wd units. If you want to learn about crossover steering I'd suggest a google search along the lines of "chevy crossover steering". ORD has some good info and products for instance. __________________ '70 K10 Suburban - TBI 454, 4L80E, NP241C, Dana 60 & 44 - The 10+ Year Project Thread Datsun 240Z, 510 2 door and an old Honda motorcycle

04-08-2011, 02:00 PM	#5
RPBurris Registered User Join Date: Mar 2010 Location: Dyer, Indiana Posts: 395	Re: Power steering gearbox 2wd vs 4wd and difference?? http://www.autozone.com/autozone/par...21546_0_12266_ Here is a kit for $45 for Autozone. My gear box is leaky to and am thinking of rebuilding it before it craps out. New gear boxes are crazy expensive. A used one is a gamble. I have also heard (but never verified) that 4wd boxes are a reverse rotation due to the location of the pitman arm. __________________ 1969 Chevy K20 Longbed

04-08-2011, 02:15 PM	#6
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Re: Power steering gearbox 2wd vs 4wd and difference?? The pitman shaft on a 2 wheel drice steering gear is both tapered and splined all of the way around, with spline seperation on them so that the pitman arm will only go on one way. The pitman shaft is also threaded on the end for a bolt that holds the pitman arm in place. The 4 wheel drive steering gear has a pitman shaft that is not tapered. However it does have a short spline section, and a groove cut in it to alow for the bolt to pas thru tightening the pitman arm. They are not interchangeable. WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys Last edited by Classic Heartbeat; 04-08-2011 at 02:16 PM.



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