Slant Six Forum :: 8.25 rear vs 8.75 rear (weight)??

The 8.25" is lighter if comparing both units with sure grips and street/drag gears (the 8.25 is a little lighter still if you find one of the 2.56/2.45 units with a sure grip), about 25-40 lbs...

8.75 with a spool vs. 8.25 with sure grip, should be pretty even although the spool isn't going to play nice for street driving.

8.75 does offer the better option for the price though...you can drive to the track with the street ratio sure grip pumpkin, take 1 hour to pull and swap it with your drag race chunk then swap back. 8.25, need to bring a second rear end to swap, or purpose build the vehicle.

8.25" are easier to get at this time if junkyarding/craigslisting, and you can still find sure grips and good ratios in pre-97 Dakotas, Rams, etc... if building on the cheap.

-D.Idiot

Author:	NCDemon1971 [ Mon Jun 17, 2013 6:45 pm ]
Post subject:	8.25 rear vs 8.75 rear (weight)??
I compared the costs of an 8.75 rear using a spool vs. an 8.25 rear with a SG unit. The spool setup for an 8.75 seems far cheaper than one for an 8.75 but of course, it is a more expensive rear to buy into. I already have an 8.25 from a Duster. I was wondering if anyone had compared the weight of the two?? I believe that the 8.25 is lighter by a small margin. If you compare the rears with a spool or sg, it may be a wash or "flip a coin"type of deal. The price for an 8.25 sg unit isn't to bad though...

Author:	DusterIdiot [ Mon Jun 17, 2013 7:11 pm ]
Post subject:	8.25" is lighter barely...
The 8.25" is lighter if comparing both units with sure grips and street/drag gears (the 8.25 is a little lighter still if you find one of the 2.56/2.45 units with a sure grip), about 25-40 lbs... 8.75 with a spool vs. 8.25 with sure grip, should be pretty even although the spool isn't going to play nice for street driving. 8.75 does offer the better option for the price though...you can drive to the track with the street ratio sure grip pumpkin, take 1 hour to pull and swap it with your drag race chunk then swap back. 8.25, need to bring a second rear end to swap, or purpose build the vehicle. 8.25" are easier to get at this time if junkyarding/craigslisting, and you can still find sure grips and good ratios in pre-97 Dakotas, Rams, etc... if building on the cheap. -D.Idiot

Author:	NCDemon1971 [ Mon Jun 17, 2013 9:29 pm ]
Post subject:	Re: 8.25" is lighter barely...
Quote: The 8.25" is lighter if comparing both units with sure grips and street/drag gears (the 8.25 is a little lighter still if you find one of the 2.56/2.45 units with a sure grip), about 25-40 lbs... 8.75 with a spool vs. 8.25 with sure grip, should be pretty even although the spool isn't going to play nice for street driving. 8.75 does offer the better option for the price though...you can drive to the track with the street ratio sure grip pumpkin, take 1 hour to pull and swap it with your drag race chunk then swap back. 8.25, need to bring a second rear end to swap, or purpose build the vehicle. 8.25" are easier to get at this time if junkyarding/craigslisting, and you can still find sure grips and good ratios in pre-97 Dakotas, Rams, etc... if building on the cheap. -D.Idiot Thanks D.Idiot.. It is for a strip only project so the 8.25 is probably a good way to go..?? I don't think I will ever break it. Lighter is better

Author:	DusterIdiot [ Mon Jun 17, 2013 9:55 pm ]
Post subject:	Yep...
Quote: It is for a strip only project so the 8.25 is probably a good way to go..?? It will hold up (they put the 8.25' behind the 340/360 cars in A-bodies and 400-2v big blocks in C-bodies... ) Since you are going only one ratio that would make for an easy one ratio axle. Note that these only come in BBP, the 8.75 came in SBP for A-body stock, and BBP if redrilled or using cut down C-body axles...(not sure if that makes a difference either...) Good Luck, -D.Idiot

Author:	Dart270 [ Tue Jun 18, 2013 3:17 am ]
Post subject:
DI has covered it. I recall that the 8.25" is only about 10-20 lbs lighter with equivalent setup (brakes, diff, gears, etc). For weight and strip only, I would find a Ford 8" bolt in (Maverick, 66-down Mustang, Granada - 5 bolt axles) and put a spool in it. Probably save you 50 lbs over one of those Mopar axles. If you get one with a Ford LSD, those are not so great, so beware. Spool would hold up. Lou

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8.25 rear vs 8.75 rear (weight)?? https://mail.slantsix.org/forum/viewtopic.php?t=52402	Page 1 of 1

Author:	Charrlie_S [ Tue Jun 18, 2013 4:06 am ]
Post subject:
Lou, Question. I am getting ready to do a rear swap to a Ford 8 inch (4.10 spool) in my 66 Valiant . I was wondering if the pinion/yoke offset of the Ford rear causes any problems in the driveshaft tunnel.

Author:	Dart270 [ Tue Jun 18, 2013 7:51 am ]
Post subject:
No problems with offset. There is a slight driveshaft vibe, but very slight and only at over 90 or so MPH. Both Valiants have these, and the 68 Dart had one for quite a while. Lou

Author:	NCDemon1971 [ Tue Jun 18, 2013 8:40 am ]
Post subject:
Thanks Lou and D.Idiot 50 pounds would make it worth my search effort. I take that if you are running one, they will hold up fine with slicks/abuse. I can't imagine these being very expensive either. The Mopar 8.75 is a great rear end but it's far to expensive to buy and build. Now to look at cost for the spool... Edit Spools are really cheap for these!!

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