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Thread: 18 Inch Wheels 78 Trans Am
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06-18-2020 #1Registered User
- Join Date
- Jun 2020
- Location
- St. Pete Beach, FL
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- 4
18 Inch Wheels 78 Trans Am
I am in desperate need of some clarification on Wheel Fitment for a 78 Trans Am. I have read all through this forum and found many different suggestions but always seemed like application was different than mine. I am currently ordering custom 18" wheels for my car. The problem I am having is the proper backspacing and allowable width. The car has 550 HP and 600 FT. I need as much meat on the back-end as I can. I didn't want to cut the car up and do mini tubs. My car has the seat belt humps massaged so I should have more room. My shop that is finishing the resto is recommending 18 x 9" all around. I'm fine with the fronts at 9 inches. Can I fit larger than 9 inch out back without rolling fender lips? Any facts on what will work with a leaf-spring car with the seat belt humps removed would be greatly appreciated.
Thanks
Hoskins Suspension
Moser 9 inch
Caltracs
Wilwood Brakes
Welded Box Frame Connectors
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06-22-2020 #2
Here’s a good thread on that topic:
https://www.pro-touring.com/threads/...d-Gen-Firebird
HTHDave
84 Monte SS - just a few bolt-ons
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06-22-2020 #3Registered User
- Join Date
- Jun 2020
- Location
- St. Pete Beach, FL
- Posts
- 4
Thanks.. The only problem is the early second gens have more room in the well. I was hoping for someone with a late second gens experience.
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06-22-2020 #4
Here’s one for later 2nd gens:
https://www.pro-touring.com/threads/...-a-77-Firebird
And here is a thread with 30+ pages, I hope there may be something of use..
http://transamcountry.com/community/...?topic=23970.0
HTHDave
84 Monte SS - just a few bolt-ons
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06-24-2020 #5Registered User
- Join Date
- Jun 2020
- Posts
- 7
I’m working with same issue right now.
1978 TA restored try to hit 10x18 with 295/40R18 with ridetech streetgrip leaf springs.
Current wheels are Year One 9x17 with 275/40R17 BS 5.125 and plenty of room in wheel well, factory height now.
Same size in front, sits nicely to ”corners” no rubbing.
Regarding rears, first problem noticed, looks axle is almost 1/2” more on passenger side so needs centering.
measured/compared with current wheel tire combo, 10x18 offset 0 BS 5.5 should fit to my car with 295/40 and 2” lowering, may require light hammering inner wheel well where’s seatbelt mounts.
fronts will go to 8.5 offset 0 and 245/40R18.
Got measuring tool and correct tire today confirm fitment, will do this asap.
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06-24-2020 #6