Posi rear end.

[79_cutty]

I got a 79 cuttlass, with a 10 bolt 7.5 rear end what posi can I put in one of these?

 

[Yav8]

You can get one out of a early S-10 being that its a 26 spline. I think after 1990 they started with a 28 spline. Find a 4cyl or v-6 blazer and it should have a good gear set with it. Grab the ring and posi and the pinion shaft. Should be a 3.42 3.73 or a 4.11.

 

[L92 OLDS]

I got a 79 cuttlass, with a 10 bolt 7.5 rear end what posi can I put in one of these?

Did you do a search on this forum?

 

[sls1025]

I don't know where your located but I have a complete rear out of my 85 MC SS you can have if you come get it. It's just sitting in my yard waiting for scrap since I'm using a 9".
I'm located in VA.

 

[JD1964]

I don't know where your located but I have a complete rear out of my 85 MC SS you can have if you come get it. It's just sitting in my yard waiting for scrap since I'm using a 9".
I'm located in VA.

If there are no other takers on the 85 Monte rear I might be interested. I
In Maryland. PM me if it’s available

 

[JD1964]

sls1025 , Thanks a bunch for the parts. We picked them up this afternoon and actually drove the wagon down to get them. It was the first decent road trip in the car since the LT1 / 4L60E swap. A good test for the car and a worthwhile purpose for trip. Round trip was about 200 miles. The car ran perfect. Fuel trims monitored on ALDL droid were nice and tight! Here's a few pics and a Vid.

 

[sls1025]

Fantastic. I'm glad that some one could use the parts. Great news about how the car ran as well.

 

[olds307 and 403]

Great gesture sls1025👍. It will wake up that wagon up. Great part about a wagon, the smoke producer fits neatly inside😎.

 

[JD1964]

Fantastic. I'm glad that some one could use the parts. Great news about how the car ran as well.

We might work on beefing up this 7.5" over time as a gradual spending project with suggestions that are in the other thread in this forum. Other options are either rare and or expensive. We figure as long as we continue running the 235/60-15 BFG TA's on the rear, they will be the fuse IE (wheel spin) and prevent breakage of the 7.5" stuff. The car actually currently has a 3.73 posi from a Monte SS but the clutches are worn. When we got the car it had an open diff 2.41. That is behind the garage on now.

What's weaker? A stock 4L60E from 94 Z28 or the 7.5" rear from a 86 Monte SS? If we pounded the setup, what is likely to break first?

 

[Screwz]

Fr

We might work on beefing up this 7.5" over time as a gradual spending project with suggestions that are in the other thread in this forum. Other options are either rare and or expensive. We figure as long as we continue running the 235/60-15 BFG TA's on the rear, they will be the fuse IE (wheel spin) and prevent breakage of the 7.5" stuff. The car actually currently has a 3.73 posi from a Monte SS but the clutches are worn. When we got the car it had an open diff 2.41. That is behind the garage on now.

What's weaker? A stock 4L60E from 94 Z28 or the 7.5" rear from a 86 Monte SS? If we pounded the setup, what is likely to break first?

from my experience I would put money on the weights in the posi existing thru the diff cover.