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1951 Chevy 6400 differential problem #1311166 Sun May 19 2019 05:04 PM
Joined: May 2019
Posts: 2
B
Bradman Offline OP
Moderated
Hi. New to the forum so I hope I’m doing this right. I’m looking for a source for rear end spider gears for the truck. Thanks for any information.

Re: 1951 Chevy 6400 differential problem [Re: Bradman] #1311176 Sun May 19 2019 07:00 PM
Joined: Nov 2005
Posts: 5,485
3
3B Offline
Master Gabster
Hy Bradman, welcome, could you provide some pictures of the differential and or any numbers you may find on the differential? If I am remembering correctly that truck came from the factory with a Timken double reduction two speed differential, but a lot could have happened in the last 68 years to change that. Is your wheel mounting pattern the same for both the front and rear axles? The Timken double reduction two speed differential is quite large and probably projects out a foot or more from the differential housing. There is a tutorial on posting pictures on the bottom left of this page, hope that helps.

Re: 1951 Chevy 6400 differential problem [Re: Bradman] #1311222 Mon May 20 2019 01:13 AM
Joined: Jun 2011
Posts: 2,809
E
EdPruss Offline
Shop Shark
Sometimes it is more productive to get a modern rear axle with the same wheel bolt pattern, those original gears are low and lower ratios, making for slow progress on the road.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
Re: 1951 Chevy 6400 differential problem [Re: Bradman] #1311285 Mon May 20 2019 07:41 PM
Joined: May 2019
Posts: 2
B
Bradman Offline OP
Moderated
Thanks for the info
The top of the differential numbers are:
AN 430 613
830
D5. 51

Back tires are 8.25x20
Fronts are 7.50x20
I’ve thought about replacing the rear end. I have a 1967 international 1600 with a 2 speed rear end that measures about the same width. I don’t take the truck on the highway. I use it around town so the slow speed is ok. I have a mechanic that works on rear end everyday and he is telling me if I can find the parts he can fix the rear end.


Moderated by  69Cuda, Grigg 

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