Differences Between LT1 & LS1 Rear Ends?
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From: A small town, MS
Differences Between LT1 & LS1 Rear Ends? Does anybody know what the major differences between the LT1 rear end and the LS1 rear end are? Is the brake system the only difference or are there others? Can the chunk from one be put in the other? Any info would be greatly appreciated.
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From: Turnin' Wrenches Infractions: 005
Yes the posi can be swapped, helps to match TCS if possible. If no TCS you will need the center reluctor wheel on the posi. 4 channels (w TCS) wont have this. So in order to keep everything functional you will have to keep the reluctor wheel that came with the car.
backing plates will interchange, gears and diffs will interchange. the 93-97 cars had 2.73-3.08 gears, the 98-02 had 3.23-3.42 so the diff carriers will be a different series... i.e. you cant put a 3.42 on a 2.73 diff unit.
the 3ch abs is the same except for the thickness of the reluctor wheel on the different series posi carriers. 98-02 were 1/2" thick, the 93-97 were 1/4" thick. the sensor for the 3ch is the same.
the 4ch(tcs) reluctor wheels on the axles were different as well. the 98-02 had a smaller, less teeth count wheel than the 93-97. 93-97 tcs is rare anyway...
you could use a lt1 housing in the ls1 car, but if the ls1 car is 4ch(tcs) then you would need to use the ls1 axles as well w/ the ls1 brakes.
the 3ch abs is the same except for the thickness of the reluctor wheel on the different series posi carriers. 98-02 were 1/2" thick, the 93-97 were 1/4" thick. the sensor for the 3ch is the same.
the 4ch(tcs) reluctor wheels on the axles were different as well. the 98-02 had a smaller, less teeth count wheel than the 93-97. 93-97 tcs is rare anyway...
you could use a lt1 housing in the ls1 car, but if the ls1 car is 4ch(tcs) then you would need to use the ls1 axles as well w/ the ls1 brakes.
With A4 tranny, they either came with GU2 - 2.73 gears or GU5 - 3.23 gears
With M6, there was only GU6 - 3.42 gears.
This was consistent the entire lifespan of the 4th gen F-body, except I think in 1993 the M6 cars came with 3.23's then starting with the '94 model year it switched to 3.42's for all factory M6 equipped F-bodies.
There is a GU4 code for 3.08 gears, but I have only seen it in V6 cars, not LT1 or LS1 cars and no one really cares about V6's.
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backing plates will interchange, gears and diffs will interchange. the 93-97 cars had 2.73-3.08 gears, the 98-02 had 3.23-3.42 so the diff carriers will be a different series... i.e. you cant put a 3.42 on a 2.73 diff unit.
the 3ch abs is the same except for the thickness of the reluctor wheel on the different series posi carriers. 98-02 were 1/2" thick, the 93-97 were 1/4" thick. the sensor for the 3ch is the same.
the 4ch(tcs) reluctor wheels on the axles were different as well. the 98-02 had a smaller, less teeth count wheel than the 93-97. 93-97 tcs is rare anyway...
you could use a lt1 housing in the ls1 car, but if the ls1 car is 4ch(tcs) then you would need to use the ls1 axles as well w/ the ls1 brakes.
the 3ch abs is the same except for the thickness of the reluctor wheel on the different series posi carriers. 98-02 were 1/2" thick, the 93-97 were 1/4" thick. the sensor for the 3ch is the same.
the 4ch(tcs) reluctor wheels on the axles were different as well. the 98-02 had a smaller, less teeth count wheel than the 93-97. 93-97 tcs is rare anyway...
you could use a lt1 housing in the ls1 car, but if the ls1 car is 4ch(tcs) then you would need to use the ls1 axles as well w/ the ls1 brakes.
Putting in a Moser 9" with 3.70 gears. The ABS sensor taken from my 2000 TA with an A4 is WAY to short to read the reluctor ring on the carrier.
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the stock rears have 3 channle or 4 channle with traction controll, the 3 channle has a reloctor gear on the ring gear and the 4 channle has reluctors on the ends of the axles, hope this help
The maginetic tip on my sensor is way to short to even come close to reading the reluctor ring in the new 9". Is there sensors with longer magenitic tips so I can get it to read my reluctor ring?
Moser used the 4ch abs sensor to work with their 3ch setups. you need to acquire a sensor from a 98-02 car with traction control. then you have to grind the tip of the sensor at 45* angles to make a flat surface like the tip of a flat blade screwdriver, and be sure that you grind the sensor with the flat running the same direction as the teeth on the reluctor wheel(side to side when the sensor is mounted in its hole). also... depending on the depth of the reluctor wheel, you need to maintain a .030 to .045 air gap between the tip of the sensor and the reluctor ring teeth when its all said and done. this air gap is very important to the system operating correctly.
the tip of the sensor will kinda look like this>>> \_/ the flat surface should be around .050" to .060" wide when you are done.
good luck!!!
the tip of the sensor will kinda look like this>>> \_/ the flat surface should be around .050" to .060" wide when you are done.
good luck!!!
Moser used the 4ch abs sensor to work with their 3ch setups. you need to acquire a sensor from a 98-02 car with traction control. then you have to grind the tip of the sensor at 45* angles to make a flat surface like the tip of a flat blade screwdriver, and be sure that you grind the sensor with the flat running the same direction as the teeth on the reluctor wheel(side to side when the sensor is mounted in its hole). also... depending on the depth of the reluctor wheel, you need to maintain a .030 to .045 air gap between the tip of the sensor and the reluctor ring teeth when its all said and done. this air gap is very important to the system operating correctly.
the tip of the sensor will kinda look like this>>> \_/ the flat surface should be around .050" to .060" wide when you are done.
good luck!!!
the tip of the sensor will kinda look like this>>> \_/ the flat surface should be around .050" to .060" wide when you are done.
good luck!!!
I got with the previous owner of the 9" and took a look at the sensor he used and this is the one.
http://catalog2.genpt.com/catviewer1...448_0229146001
From my research and calling the local parts store no one makes this style any more.
the one you have in the pic is the factory 3ch(non traction control) type. on my 9 inch rearends this is the type that is used. remove it from your original rearend and put it in the new one. the one you have in the Napa link is the factory style for 4ch(with traction control) type. this is the sensor I described above and needs to be modified to be used in a Moser rearend equipped w/ the 3ch abs mod.
A 3.42 gearset from a LT1 6 speed car is the same gearset as a 3.42 from a LS1 car and both are 3 series. A carrier from a 2.73 car has a longer dimension from the pinion centerline to the ring gears' mounting surface flange. The ring gear from anOEM 3.42 gearset is too short in its' thickness to use. An aftermarket 'thick' 3.42 gearset has to be used.
also, if it matters to anyone, (does for me), 93-98 used auburn cone type LSD's where as 99+ used torsen style LSD's. 3.08-2.XX gears were a 2 series dif. 3.23-3.73+ were 3 series factory.
"So which is better Auburn or Torsen?"
when it comes to our little 10 bolts,I don't think either one is better as they're both prone to failure at our power levels.
Being that you're automatic,that improves the situation.
Auburns fail in the respect that 'spiders' break.
Torsens failures are generally catastrophic and seem to be of a higher failure rate than Auburns,at least that's what has been appearing lately. Recently there's been threads about the end bolts(that hold the torsens' internals) coming loose and hitting the carrier caps.
when it comes to our little 10 bolts,I don't think either one is better as they're both prone to failure at our power levels.
Being that you're automatic,that improves the situation.
Auburns fail in the respect that 'spiders' break.
Torsens failures are generally catastrophic and seem to be of a higher failure rate than Auburns,at least that's what has been appearing lately. Recently there's been threads about the end bolts(that hold the torsens' internals) coming loose and hitting the carrier caps.
