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Author Topic:   Rules
Fast406
Dirt Roller

Total posts: 8
posted June 12, 2005 10:50 PM  
The rules for a stock car class im looking at getting into state GM car must use GM rear end. What is the best solution for a good rear end to fit a Metric chassis car that will bolt up without modifying to many mounts? the lower mounts on the rear end can be moved but the top must mount up stock. Was thinking of maybe a 68-72 chevelle 8.5? Any suggestions? Thanks in advance.

powerglides
Dirt Freak

Total posts: 374
posted June 13, 2005 09:39 AM  
use the metric rear, put mosier axles in it. The 68-72 chevelle is 8.2 i think

redneck racing
Dirt Forum Champ
Total posts: 860
posted June 13, 2005 11:42 AM  
Find yourself a good 12 bolt. Eddie

DangerZoneRacing
Dirt Maniac

Total posts: 176
posted June 13, 2005 04:30 PM  
I run a 81 cutlass and I put a 8.5 out of a 75 monte in it. The lowers bolt right up with a little persuasion and the uppers only need to be redrilled 1 1/4 in farther forward. If you want you can tach weld washers on your redrilled holes to be on the safe side. I havent and there doesnt seem to be any problems. The 8.5's are way easier to find gears for then those weak little 7.5's. I also had to weld 1/2 bolts on the lower control arm mounts on the back side to mount my shock (monte shocks are on the front of the rear end). The mid 73-77 chevelle/malibu's are perfect cuz the shocks mount on backside. The springs sit a little farther back on the rearend but it isnt to bad of a angle. Also the drive shaft will be about a inch to long now. I shortend mine by drawing a straight line lengthwize on the shaft and put it in the chop saw with that facing up then I kept that straight up when I made my second cut, so if the chop saw was off a little it would be off the same on both cuts and would still be straight. I stick welded it back together and have been running it 2 years now and no vibration. All in all its a fairly simple installation to have a very reliable rear. Good luck. If you have any questions just PM me. Later.

97dirt
Dirt Forum Racer

Total posts: 94
posted June 13, 2005 06:26 PM  
The GrandNationals and Hurst Olds and the 80's Impala and Stationwagons came with 8.5 rearends that will bolt right in, The Impalas are easy to find but some of them came wity the 7.5 I guess what ever Chevy had for that day is what they stuck in 'em

racer17j
Dirt Forum Champ
Total posts: 5390
posted June 13, 2005 06:42 PM  
DangerZone is right... I put a rear end from a late 70's full size with the four link into a 80 something metric Regal. The lowers only needed slight persausion, and instead of redrilling, I just made new upper arms. The new rear was indeed a little wider (I think it was about 2in.) I added some pieces of flat steel for the shocks to mount to and added a bracket for the brake line.

If you wanna go all out then some companies (Moser and or Currie) are now offering high strength bolt in 12 bolts for some applications. The even have 9in style ends to eliminate the C-clips.

If you do decide to go with a factory rear- no matter what is out of the axles should upgraded, and if possible the C-clips should be eliminated.

[This message has been edited by eenfield (edited June 13, 2005).]

Fast406
Dirt Roller

Total posts: 8
posted June 13, 2005 08:16 PM  
Thanks for the reply's. Yes I would like to stay away from the 7.5 if all possible. So the top mounts go right up just need redrill holes? Could you work on pinion angle by doing this? Just wondering. Thanks again.

eenfield
Dirt Maniac

Total posts: 116
posted June 14, 2005 05:26 PM  
BTW, if I remember right, the uppers did not want line up with out some fairly heavy forcing... Beside the fact that they were too long, that was another reason why I made my own uppers.

Yes you can change your pinion angle with the length of the uppers.

neil rucker
Dirt Forum Champ
Total posts: 799
posted June 14, 2005 06:59 PM  
forcing? your car will not work at its full potential all bound up. my 2 cents worth.

DangerZoneRacing
Dirt Maniac

Total posts: 176
posted June 14, 2005 10:25 PM  
When i put mine in the uppers slipped right over with no problems. I forgot too....you'll want to use the rubber brake line from the 8.5 rear and dont attach it to the braket. I just let my brake line hang and Its still works. It is well worth the work to put this beefier rear end in. You'll be pleased with the out come. I know I am, No matter how much the guys I race against don't! LMAO. I have no money what so ever into my rear end swap. A friend gave me a 1980 Firebird Rear end with a 3.73 posi in it, and then another friend gave me the Monte Rear, Then i just put the 3.73's in the monte rear and welded up the spiders. I saved the posi carrier for a future project. Cant beat the price I got mine for. Good Luck!

ruggs66
Dirt Maniac

Total posts: 193
posted June 15, 2005 12:26 AM  
Hey Fast406,

why don't you want to run the 7.5?

just curious.........

Fast406
Dirt Roller

Total posts: 8
posted June 15, 2005 03:48 PM  
Just dont seem it would be tuff enough, and id rather use something with possibly bigger axles from the start. There is a class here that requires the use of the stock 7.5 metric rear end.. And I have heard of guys having to spend lota money on axles and or convert the ends of the housing to accept ford bearing type axles.. I read post on here were someone say the Moser axles are almost bullet proof? Im not gona say the track were I would race at is rough.. but its not the cleanest either. Small amount of wheel bumping going on each week.

eenfield
Dirt Maniac

Total posts: 116
posted June 15, 2005 04:17 PM  
quote:
Originally posted by neil rucker:
forcing? your car will not work at its full potential all bound up. my 2 cents worth.

I meant that they would have bound up if I would not have made my own uppers. I tried the stock ones just to see where I was at. (A starting point)

    

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