What do I need to do the switch. And give me details please on how to do it. It doesn't seem to want to fit... I need help

What doesn't seem to want to fit? The only real difference is the width of the rear, and that will only effect what rims you will have to use.

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'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors, Whatever chip I feel like burning,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

Okay, sorry. I'm not real good with cars, I'm asking this question for a friend. He says that the spacing or something is 2 inches too small (maybe large) on each side and won't allow it to fit. New wheels are expected. I think it's two inches too short on each side, how do you get around that?

The fourth gen units are 2inches wider on each side. You should be able to use the same wheels by letting them stick out, but it might look funny. It should fit with his wheels.

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88 firebird formula
350 Vortec TBI
214int/224exh, .471int/.491exh
Edelbrock headers
SIX-speed
open 3.73's
2 1/4 stock catback
I love pissing those LS1's off
My Formula

I was wondering about this too. Would the stock 4th gen wheels stick out or just ht original wheels? My camaro wheels are dished more than the 4th gen wheels. I you uesed the 4th gen wheels would they still stick out to much?

I'm thinking about swapping to a 4th gen rear also. The 4th gen wheels shouldn't stick out b/c they have different backspacing than do the wheels for the 3rd gens. The only reason I'm thinking about doing the swap is the price. I can get a whole 4th gen rear end for $250 w/3.23 or $300 w/3.42. I need new ring and pinion gears and a pinion bearing for mine. Still not exactly sure what I'm going to do though.

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87 Camaro Z28
LB9 305 TPI, Accel cap, rotor, and 8mm wires, K&N filters
1/8 mile: 9.8@69mph

91 Formula
L98 350TPI, Accel 8.8mm wires, Siamese Runners, Edelbrock Headers, Edelbrock 3" Cat-Back, Airfoil, K&N Cone Air Filter, AFPR, Shift-kit, Mallory Promaster Coil, Nitrous Works Wet Kit 75hp
1/8 mile: 7.9@86mph

Just so yall know there is a tech article on this on the home page here.

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1988 Camaro
305 bored .030 over
Stock TBI
Aluminum radiator
No smog pump
gutted factor cleaner
cam ground to crane specs
timing advanced 9 degrees
no thermostat
other than that its bone stock and ran a 16.4 @ 82 mph with earth shattering wheel hop and a 2.88 60 ft time. (this was with the rebuild and cam only)

I read the tech page but it didn't answer my question about the rims. I tried to email the guy who wrote it but haven't received a response yet.

I would guess that the 4th gen wheels will stick out just a touch. You won't be able to use your 3rd gen rims though because the brake calipers will hit the rims resulting in the whell not turning. I tried to use IROC rims on my 97 Z28 with slicks. I'm going to go out on a limb and say that the 4th gen rims will stick out 1/2 to 1 inch. After all our 3rd gen rims don't sit flush tih the fender wells and the 4th gen rim will compensate for this. After that its all up to the backspacing. what you can do is take off one of your rims.......then add two inches to yoke (the end of the axle where the rim mounts to) and then add the rims mount serface to outer lip to that.

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1988 Camaro
305 bored .030 over
Stock TBI
Aluminum radiator
No smog pump
gutted factor cleaner
cam ground to crane specs
timing advanced 9 degrees
no thermostat
other than that its bone stock and ran a 16.4 @ 82 mph with earth shattering wheel hop and a 2.88 60 ft time. (this was with the rebuild and cam only)

Thanks for the info. I'm going to get the stuff tomorrow so I should have it together sunday night. All of my stuff(17inch wheels,tires and rear end came of the same car so it should all fit together pretty well