rear end swap

when swaping a rearend on a 91 rs to one from a 4th gen is there a certain 4th gen year i should get. wich ones have the better gears. and most of all does the swap go strait in or do i have to get any conversion parts.
thanks

when swaping a rearend on a 91 rs to one from a 4th gen is there a certain 4th gen year i should get. wich ones have the better gears. and most of all does the swap go strait in or do i have to get any conversion parts.
thanks

Tcfco, i'm gonna do the samething eventually. I hate drum brakes. I think all my springs came loose back there. I would like to know about the 4th gen swap too. I believe you would have to change the master cylinder, and you're gonna have to add abs too. I'm not too sure.... someone help us out!!

Why waste the time and money taking out one shitty 7.5 ten bolt and replacing it with another shitty 7.5 10 bolt.


Other than that, you would need a new master cylinder but, I am not sure if you would need the the abs unit

Why waste the time and money taking out one shitty 7.5 ten bolt and replacing it with another shitty 7.5 10 bolt.


Other than that, you would need a new master cylinder but, I am not sure if you would need the the abs unit

Hyspi87, wouldn't a 4th gen 10bolt be better than a 3rd gen? Didn't most of them come with better gearing and discs brakes? I know mine has 2.73 and drums. Are the 700r4s from 85-92 almost identical to 4le60(is that it? i don't know) from the 4th gens?

i have a 91 rs with a 700-r4 and im pretty sure i have the same rearend set up as you link. and hypsi what rear end would be better then.

a 12 bolt, ford nine inch blah blah blah
moser, strange engineering people like that make them

3rd gen, 4th gen it does not matter. It is still a POS 10 bolt with the small 7.5 inch ring gear. Sure the carriers might be different. If you guys are serouis about making power, or running some sticky tires. you will blow that rearend up in a matter of weeks.

a 12 bolt, ford nine inch blah blah blah
moser, strange engineering people like that make them

3rd gen, 4th gen it does not matter. It is still a POS 10 bolt with the small 7.5 inch ring gear. Sure the carriers might be different. If you guys are serouis about making power, or running some sticky tires. you will blow that rearend up in a matter of weeks.

Naw don't want too much power just enought to be able to run low 13's in the future(way into the future), could we just beef up the 10 bolt to handle i say 300rwhp? Btw hyspi, what rearend do you have in the GN?

Naw don't want too much power just enought to be able to run low 13's in the future(way into the future), could we just beef up the 10 bolt to handle i say 300rwhp? Btw hyspi, what rearend do you have in the GN?


if you want the power to run low 13's you will break that rearend. (assuming you are going to be on a set of sticky tires)

The GN has a 10 bolt in it but it is the beefier 8.5 inch ring gear 10 bolt. They are 12 bolts in 10 bolt colthing. they will hadle crazy power with no problem

if you want the power to run low 13's you will break that rearend. (assuming you are going to be on a set of sticky tires)

The GN has a 10 bolt in it but it is the beefier 8.5 inch ring gear 10 bolt. They are 12 bolts in 10 bolt colthing. they will hadle crazy power with no problem

Could you put a 8.5 inch ring gear in our 10 bolts?

Could you put a 8.5 inch ring gear in our 10 bolts?

nope the 8.5 ten bolt has an entirely different carrier.

Also to my knolwedge, no one makes one to go into the F-bodies.

You could go with the nine bolt aussie rearend out of the IROCS and TTA's and GTA's

nope the 8.5 ten bolt has an entirely different carrier.

Also to my knolwedge, no one makes one to go into the F-bodies.

You could go with the nine bolt aussie rearend out of the IROCS and TTA's and GTA's

I think i'll just suck it up and hope in the future that i can run into one of those nine bolts. I saw a couple on ebay for a couple of hundred dollars, but they are to far away to deliver to my area. Junkyards i've gone too only have regular maros' and birds'. I'll keep a look out for one.
So tcfco, i think we both should aim to try and aquire one of these nine bolts, cuz i also think they will be a direct fit. Correct me if im wrong.

how much power can those 9 bolts handle.

If you run the 12 bolt or 9 inch keep in mind it'll rob more power

If you run the 12 bolt or 9 inch keep in mind it'll rob more power

What do you mean by rob more power? Weren't those 9 bolt from the 350 irocs and ta's weren't better than the crapola i have now. If your talking about losing out on top end power, i read an article from an old motor trend magazine on the web about the top 10 fastest cars test (in 1988)iroc and Gta were in it. Iroc top out at 147, while the Ta top out at 141.

9 INCH not 9 BOLT, i dont know much abotu the 9 bolt. But the 12 bolt or ford 9 inch are bigger than the 10 bolts, and heavier. More mass to rotate = more power los to the wheels. 4th gen 10 bolts can hold up to I think it's around 400 horses... get one out of an LT1 for your cars, and make sure it's one without traction control.

9 INCH not 9 BOLT, i dont know much abotu the 9 bolt. But the 12 bolt or ford 9 inch are bigger than the 10 bolts, and heavier. More mass to rotate = more power los to the wheels. 4th gen 10 bolts can hold up to I think it's around 400 horses... get one out of an LT1 for your cars, and make sure it's one without traction control.

I apologize 97, I should of read post more carefully. So 4th gens came without traction control, so all that means we would have to replace would be the master cylinder? It looks like it more easier to get a 4th gen rearend rather than the 3rd gen 9 bolt. Is that 400 crank or 400wheel horses? Also can't we just beef the damn things up parts like posi units and stronger gears? I really need to get discs in the back, i can't stand those damn drums. I changed them the other day and it was aggrivating as hell, but a learning process at the sametime.

drum brakes arnt that bad i like them cause they leave no brake dust like the front do. and the more you change them the easier it gets just like everything else.

drum brakes arnt that bad i like them cause they leave no brake dust like the front do. and the more you change them the easier it gets just like everything else.

Yeah your right about that. Trying to get that brake dust that has been on the rims for a while is a bitch. And things do definitely get easier the more you do it. Practice makes perfect, learned that from the old G.I. Joe commericals.

of the subject have you ever gone to ebaums world and seen the g.i. joe cartoons...there great

get a 9 bolt 7.75 inch, a whole .25 inch bigger !

if you throw in a 4th gen rear you need to use 4th gen wheels or different wheels from the stock 3rd gens i think. the rearend is wider on the 4th gen.

that's right... the 4th gen rear end is wider. this is why you need spacers to put 4th gen wheels on a factory 3rd gen.

SOme had TCS, some didnt. They all have limited slips and discs. I didn't have to change ANYTHING except the rear end itself.

what kind of gearing does a 98 z28 have? I have a buddy of mine whos got one and he is looking at getting a moser 12 bolt. I don't need that because I not looking to have that much power....yet.....So if the gearing from the 98 Z beats the stock gearing in my 89 RS that the previous owner told me had a 3rd gen Z rear put in cuz the original blew out....then id do that. Providing I could take the rear end from a 98. They didn't have TCS did they? And would ABS or the parking brake be a problem with this type of swap?

auto or manual? and some have tcs some dont it depends on the car

10 bolt will handle 13 second runs just fine, F bodies ran them stock at that speed when they went out. A proporly built 10 bolt rear end will handle around 400-450hp. as for the 9 bolt, im not exactly sure as to the power it can handle in numbers, but i know they will survive behind a 500hp big block.