87 3+3 4x4 swd rear width

[Chips-resto]

OK,I've heard this rear is the same as a dually and know it's not. It's about 4 inches norrower than a dually Can anyone back me up on this. I know for a fact this is the factory rear so that can be ruled out. I'm going to pick up a dually rear out of the same year truck and need to know both widths so I have the correct one

[b454rat]

Cab n chassis is 63", single is 67" and dually is 74".


First 2 will be 14ff, the latter being a Dana 70, maybe a 14 but unlikely.

[Chips-resto]

the glove box build sheet says GU4 rear axle option. It is a one tone swd 4x4

[Chips-resto]

Originally Posted by b454rat

Cab n chassis is 63", single is 67" and dually is 74".


First 2 will be 14ff, the latter being a Dana 70, maybe a 14 but unlikely.

OK,now where can I find those numbers,my front has the 60 stamped on front case making it a dana 60 but how can I figure out the rear. The tag has been long gone over the years of fluid changes

[Dooley]

Originally Posted by Chips-resto

the glove box build sheet says GU4 rear axle option. It is a one tone swd 4x4

GU4 denotes a 3.08 axle ratio.

[b454rat]

If it has 5 bolts around the yoke, aka pinion support, it's a 14ff. If the cover looks like a Dana 60, then it's a 70. But being it's a srw, 99% chance it's a 14ff.

Only gears available on 1 tons, 3.73, 4.10 and 4.56.

[Dooley]

Originally Posted by b454rat

Only gears available on 1 tons, 3.73, 4.10 and 4.56.

Yes, my point should have continued that I think the glovebox lid might have been changed. GU4 is the code for 3.08 axle ratio 1976-2002. He should check the ID number on the tag to the one on the truck.

[Chips-resto]

Ya,it's got the bolts around the yoke and I looked at the wrong glove box lid. Forgot I changed it out. I know it's got the 4.10's in it. Thanks for all your help. I knew I wasn't loosing it,yet

[Driveway Dreams]

Originally Posted by b454rat

Cab n chassis is 63", single is 67" and dually is 74".


First 2 will be 14ff, the latter being a Dana 70, maybe a 14 but unlikely.

I assume that these are axle widths. Not full outside of tire to outside of tire widths. Right? And are those measurements true just of our square body trucks?

[2tons of fun]

there is a ****ton of d70 rears out there ranging from 65" to 75"+

but knowing your wms's can quickly tell you if it was a dodge, ford, or chevy.

14bff have 6 bolt around the pinion, ford 9" have five.

14bff can have gears as low as 3.21.

[b454rat]

Originally Posted by Driveway Dreams

I assume that these are axle widths. Not full outside of tire to outside of tire widths. Right? And are those measurements true just of our square body trucks?

Those measurements are wheel mount to wheel mount. Mostly 73-87 style, never measured any of my 88-up stuff.