89 vs 91 Formula rear crash bar + honeycomb
Thread Starter
Joined: Jul 1999
Posts: 12,089
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
89 vs 91 Formula rear crash bar + honeycomb
I know the front is different, but will a 91 rear bumper from a 91 formula fit over the honeycomb of an 1989 or does the comb need to be swapped too?
-- Joe
-- Joe
Joined: Oct 2001
Posts: 12,214
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: 89 vs 91 Formula rear crash bar + honeycomb
I'm fairly sure they are different enough to be a issue.
Thread Starter
Joined: Jul 1999
Posts: 12,089
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: 89 vs 91 Formula rear crash bar + honeycomb
Senior Member
iTrader: (5)
Joined: Aug 2010
Posts: 916
Likes: 9
From: Wichita Falls, TX
Car: 91 Firebird,00 c2500,75 Vette
Engine: 3.1 but 350 soon, 350, 350
Transmission: T56 soon
Axle/Gears: stock 3.42 Posi to come
Re: 89 vs 91 Formula rear crash bar + honeycomb
I swapped the other way to the 89 style. I noticed that the 91 honeycomb is about 1/2 inch to 3/4 inch thicker in places. The bumper cover would not be supported very well with out the right honeycomb. The steel bumper reinforcement bar does not have the holes drilled in all the right places for the 91 bumper cover bottom push tabs but that is easy to deal with. If it is not to much trouble get the right honeycomb.
Thread Starter
Joined: Jul 1999
Posts: 12,089
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: 89 vs 91 Formula rear crash bar + honeycomb
I swapped the other way to the 89 style. I noticed that the 91 honeycomb is about 1/2 inch to 3/4 inch thicker in places. The bumper cover would not be supported very well with out the right honeycomb. The steel bumper reinforcement bar does not have the holes drilled in all the right places for the 91 bumper cover bottom push tabs but that is easy to deal with. If it is not to much trouble get the right honeycomb.
Thanks for the info
-- Joe
Thread Starter
Joined: Jul 1999
Posts: 12,089
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: 89 vs 91 Formula rear crash bar + honeycomb
Ok I got the impact bar too.
Fun stuff.
-- Joe
Fun stuff.
-- Joe
Senior Member
iTrader: (5)
Joined: Aug 2010
Posts: 916
Likes: 9
From: Wichita Falls, TX
Car: 91 Firebird,00 c2500,75 Vette
Engine: 3.1 but 350 soon, 350, 350
Transmission: T56 soon
Axle/Gears: stock 3.42 Posi to come
Trending Topics
Thread Starter
Joined: Jul 1999
Posts: 12,089
Likes: 125
From: SALEM, NH
Car: '88 Formula
Engine: LC9
Transmission: 4L60E
Axle/Gears: 3.89 9"
Re: 89 vs 91 Formula rear crash bar + honeycomb
I probably won't have time to spray the parts this fall anyway. I have heat in the shop, but I get nervous using the spray gun when the furnace is on because I don't know how sealed the furnace is. But this spring I'll spray the bumper covers, ram air hood and it should look nice.
-- Joe
Thread
Thread Starter
Forum
Replies
Last Post
Arctic White 91 RS
Aftermarket Product Review
67
Apr 12, 2022 07:51 PM
padak
Engine/Drivetrain/Suspension Parts for Sale
12
Nov 16, 2016 04:58 PM
retro-roco
Firebirds for Sale
0
Sep 11, 2016 01:46 PM









