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Old 12-19-2012, 09:50 PM   #1
bkkpool
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What rear end?

Can anyone tell me what rear end is in this truck from the SPID?


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Old 12-19-2012, 09:52 PM   #2
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Re: What rear end?

I may be wrong but to my knowledge no
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Old 12-20-2012, 12:21 AM   #3
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Re: What rear end?

I'm gonna take a swing and say a 12 bolt...

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Old 12-20-2012, 12:24 AM   #4
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Re: What rear end?

It's a half ton, and I believe the standard rear end was probably a 3 .73 12 bolt.
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Old 12-20-2012, 12:58 AM   #5
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Re: What rear end?

Unless it shows something specific on the spid, i'm pretty sure big blocks with automatics came with a 3:08 Ratio.
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Old 12-20-2012, 01:00 AM   #6
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Re: What rear end?

Will it be an open or limited slip in a BB truck?
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Old 12-20-2012, 01:08 AM   #7
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Re: What rear end?

Could be either.

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My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

Quote:
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I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
Quote:
Originally Posted by Marv D View Post
Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
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Its cheaper to listen to advice given when you ask for help than it is to ignore everyone and wait for carnage.
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Old 12-20-2012, 01:22 AM   #8
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Re: What rear end?

I am 99% sure if the truck came with Limited-Slip Positraction it was an option so it'd be on the spid. Are you sure the original rearvend is in your truck?
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Old 12-20-2012, 01:41 AM   #9
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Re: What rear end?

I'm fairly confident it is the original rear end. I'm considering buying it for parts and to part out. Unfortunately the motor was swapped 20+ years ago. I may go see the truck this weekend.
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Old 12-20-2012, 04:23 AM   #10
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Re: What rear end?

Chevy 3500lb axle (AKA 12 bolt). 3.07 gears with no listed option except open or posi..
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Old 12-20-2012, 11:00 AM   #11
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Re: What rear end?

It appears that it is an open 3.07.Thanks for the info.
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Old 12-20-2012, 11:30 AM   #12
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Re: What rear end?

The SPID on my truck (350/350) doesn't list any particulars about the rear end.
So, from what you guys are saying, it is safe to assume it uses standard eqipment (3.07).

However, there is no way the rear end has 3.07 in it. It is wound like a top at 60MPH. It is nearly unbearable. I don't have a tach, but I'd estimate 3500 RPM @ 60 MPH.

Any ideas? At what RPM should 3.07 be @ 60 MPH?

I might as well just yank the cover and look in the case. It has started dropping oil anyway.
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Old 12-20-2012, 12:22 PM   #13
1972SUPERSB
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Re: What rear end?

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Originally Posted by IHeartGroceries View Post
The SPID on my truck (350/350) doesn't list any particulars about the rear end.
So, from what you guys are saying, it is safe to assume it uses standard eqipment (3.07).

However, there is no way the rear end has 3.07 in it. It is wound like a top at 60MPH. It is nearly unbearable. I don't have a tach, but I'd estimate 3500 RPM @ 60 MPH.

Any ideas? At what RPM should 3.07 be @ 60 MPH?

I might as well just yank the cover and look in the case. It has started dropping oil anyway.
Prob had some lower gears installed in it at some time. If I would guess you should be around 2400 rpm or so with 3.07 also depending on what you tire size is.
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Old 12-20-2012, 02:01 PM   #14
IHeartGroceries
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Re: What rear end?

Thanks for the input! I am really starting to think that may be a real possibility. I know my grandfather wouldn't have done that when he owned it. But, seeing as my great uncle, the original owner, added saddle tanks and a trans cooler, so he could pull his horse trailers on his ranch, it really make sense. I'll have to grill my grandfather to see what he knows. I really presumed everything was factory (virtually everything else is), because of their traditional "if it aint broke, don't fix it" mentality.
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Old 12-20-2012, 02:10 PM   #15
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Re: What rear end?

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Originally Posted by IHeartGroceries View Post
Thanks for the input! I am really starting to think that may be a real possibility. I know my grandfather wouldn't have done that when he owned it. But, seeing as my great uncle, the original owner, added saddle tanks and a trans cooler, so he could pull his horse trailers on his ranch, it really make sense. I'll have to grill my grandfather to see what he knows. I really presumed everything was factory (virtually everything else is), because of their traditional "if it aint broke, don't fix it" mentality.
There is a gear ratio calculator which you can google and will tell you what your ratio is. Just need height of tires. Need a tach to get accurate results.Or you can just jack up the rear end of the truck and note how many times the driveshaft turns in relation to the tire
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