88fbird

Will lt1 brakes fit on an ls1 10-bolt? Do you have to shim the backing plates? I'm trying to get my 10-bolt ready to drop in, but I can't seem to find any ls1 brake parts.
Will I need an adjustable prop valve? I'm going from disc to disc.
Thanks,
FBird

ebmiller88

iTrader: (7)

They should bolt in fine with the LT1 backing plates and you shouldn't have to shim anything. If so, Andy Z28 has some shims available IIRC. I wouldn't bother with the prop valve either.


Ed

Marc 85Z28

iTrader: (3)

I have an 02 TA rear with a brake setup from a 94 Z28 and can tell you they DO NOT fit. The rotors will hit the caliper bracket. You can solve this 1 of 2 ways. Install thin spacers between the rotor and axle hub, or grind down the inner edge (facing the back of the rotor) of the bracket to clear. You will need to grind off a good bit, but not so much that it would affect the brackets strength.

LS1 rear brakes sit out farther than LT1 rear brakes, and that's due to the LS1's emergency brake setup. That's what causes the interference.

Others on this board had the same problem, I believe Mr_Dude_1 was one of them.

ebmiller88

iTrader: (7)

I stand corrected, thanks Marc. There must be a difference in axle lengths then.... I would think the axle flanges would be the same with just the minor differences in the brake setups.

Ed

Marc 85Z28

iTrader: (3)

There is an axle length difference, I thought that was common knowledge. The LS1 axles are slightly shorter than the LT1 versions. There is almost a .5" difference hub to hub between the 2.

ebmiller88

iTrader: (7)

New info to me, I haven't done much work with the 2 types of rears (LT1/LS1).

Ed

HalfInchWrench

It is true. LS1 or all 4th gen axel's for that matter are longer than 3rd gens.

All 4th gens are interchangable. There are some differences tho. 3 and 4 channel ABS. 4 channel has a reluctor gear on the hub. 3 channel rides off the ring gear.

LSD's/bearings/gears/LCA's, pan hard bar ect are interchangable from 3rd to 4th gens. Keep in mind the earlier 3rd gens have 26 spline axels. All 4th gens have 28 spline axel's. I forget what year the 3rd gens switched to 28 spline axels. Think it's 89 or 90. That will make a difference if you are changing carriers and the like.

ebmiller88

iTrader: (7)

Right..I was talking about the individual axle length, not the overall rearend length. 4th gen rears are about 2" longer per side.

GM swapped to 28 spline axles in late '89.

Preachin to the choir but thanks for the input.


Ed

HalfInchWrench

Well jumped up jeezus on a stick,


MY name is Ed too!!!!


I supppse now someone should say....

All Ed's think alike!

Grumpy

<Confused>

Will a LS1 rear disc set-up bolt onto a 3rd Gen, other then emergency brake cable issues?.

Are all the axle lenght differences because the axle housings are different?. Or because the backing plates, are different?.

TIA

Zepher

iTrader: (1)

I put a set of 96 LT1 brakes on a 98 LS1 rear and they sat fine and worked ok I guess. did they change something on the later year LS1 rears?
btw, we did this swap since it was taking so long to grind down the LS1 brakes to fit over the 15" Pro Stars.

DuronClocker

iTrader: (1)

I'm interested to hear some more information about the LT1/LS1 difference in axles. That's unlike everything else I've been told. I could see the axle tubes being shorter a bit to make up for it, but I thought the axleshafts were the same length among all 4th gens.

Marc 85Z28

iTrader: (3)

Odd. I have a 3 channel rear on mine, maybe you have the 4 channel? Others on CamaroZ28.com, all 4th gen guys, have had similar issues.

Zepher

iTrader: (1)

The 96 brakes were 4 channel style with sensor holes in the backing plates and the LS1 rear and axles were 3 channel.