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Username Post: ?? rear end help ??        (Topic#347585)
Posts: 145

Reg: 10-20-07
10-09-17 11:27 AM - Post#2710294    

I got a 1988 Chevy 3500 (single Wheel 8600lb gross) a 14 bolt 8 lug.

I been hearing a soft screeching sound for last couple hundred miles at low speed. I thought it was brakes, then u joint, now I felt the neck of the rear end gets hot enough that you dont want to keep your hand on it.

First question is, "what years or what year to year, of rear ends will swap out?

I'll be back with more questions later. thanks for now.

Low priced Genuine GM Auto Parts
Frequent Contributor
Posts: 2403
Age: 44
Loc: West Michigan
Reg: 02-18-12
10-10-17 12:39 AM - Post#2710372    
    In response to weld123

Should be any 14bff from the GMT-400..... they went through 2000 in the 1-ton. You might want to keep your same brake RPO. Mine is JB8, what is yours? I think 2500's usually got JB7, so even though it's a 14bff, the brakes may be different.

Do you have slide off drums or are they on the back of the hubs?

99 K3500 RCLB

Posts: 145

Reg: 10-20-07
10-11-17 01:54 PM - Post#2710549    
    In response to 454cid

I been having a tough time with this. I have a G80 rear end. GT4 ratio. But the brakes I don't know yet. The sticker is ledgible, I found a J50, but not seeing a JD or JB, of any sort. I turned drive shaft almost 3 3/4 revolution, to make wheel turn one revolution. Slightly over 7 1/3 rev. for wheel 2 revolutions, and exactly 11 revolutions of drive shaft to turn wheel 3 times.

I'm not sure its the original rear end, cuz, its got 93 Written on diff. cover with a paint marker, as it may have come from a wrecking yard.

I live in a farming community, so I'm trying to find a dead truck laying around on some ranch or something, cuz I think I'd be able to get a whole parts truck for a probabaly double of the cost for a rear end.

I trying to determine what range of years and models of truck will have a swap out rear end.

I took diff cover off, after driving it, and the "case"( the big yoke looking thing with a hole on one side, and opening on other side that holds a rack gear on a small dia shaft), i think its called felt a little hot. I still havent been able to locate anything wrong inside though. thanks

Edited by weld123 on 10-11-17 01:56 PM. Reason for edit: No reason given.

Posts: 28372
Age: 47
Loc: Texas
Reg: 08-01-03
10-11-17 02:21 PM - Post#2710554    
    In response to weld123

Since you've got the cover off, just turn the wheel until you can see the numbers stamped into the edge of the ring gear - that will tell you the number of teeth for the ring and pinion, then simple division will give you the ratio.

In that example with 41 and 10, divide 41 by 10 and you see it's a 4.10:1 ratio setup.


06 Silverado ISS / 06 Silverado SS / 06 300C SRT8

Posts: 145

Reg: 10-20-07
10-11-17 08:28 PM - Post#2710590    
    In response to someotherguy

ahhh, thank you, that sounds easy.

Low priced Genuine GM Auto Parts
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