beef up a 7.5 rear
#1
beef up a 7.5 rear
is it possible to build the exsisting rear in my 80 cutlass to hold up to the 455 im building?will be over 500 ft.lbs of torque.ive looked at an auburn carrier and moser axles that are priced in my budget but not sure hold it would all hold up.i would rather not change out the entire rear if i dont have to .this will be mostly a street driven weekend tire fryer with 3:23 gears. thanks for any input
#2
beefed up 7.5
On the steet it will be fine as long as you use aftermarket posi unit as and axles and most importantly SET IT UP CORRECT. The set-up is what really makes parts last long and give them the strength.
The best 7.5 set-up i have seen is the 28 spline moser unit with a true trac unit and any aftermarket gears.
dura grip and eaton and auburn will still all be a major improvement over the stock carriers. ALL 28 spline.
IF you are going to the track and you hit that rear too hard the spiders will blow sky high after about 5-10 hits... IF you do round de round racing...meaning you hot lap at the drag race track. Heat up and cool down make life a lot easier on parts.
Remember too NEW ring and pinion (and really all metal parts new castings) like a break in period for hardening to happen ...The heat up and complete cool down is what rockwell the ring and pinion and it sure does not hurt the rest of the steel parts in the rear.
Good luck, Jim
J D Race
The best 7.5 set-up i have seen is the 28 spline moser unit with a true trac unit and any aftermarket gears.
dura grip and eaton and auburn will still all be a major improvement over the stock carriers. ALL 28 spline.
IF you are going to the track and you hit that rear too hard the spiders will blow sky high after about 5-10 hits... IF you do round de round racing...meaning you hot lap at the drag race track. Heat up and cool down make life a lot easier on parts.
Remember too NEW ring and pinion (and really all metal parts new castings) like a break in period for hardening to happen ...The heat up and complete cool down is what rockwell the ring and pinion and it sure does not hurt the rest of the steel parts in the rear.
Good luck, Jim
J D Race
#5
Agree on the Trutrac, it eliminates the tiny spider gears. Look at 4th Gen Camaro/Firebird, many had 3.23 or 3.42 gears with the Zexel Torsen(Trutrac) worm gear posi, usually used combos on eBay, just add Moser 28 spline G body axles. The stock 26 spline spider gears are soft, I exploded a set with my 403. I used the Yukon spider gears, help up fine with slicks, unlike stock spider gears or the Powertrax No Slip.
#7
Ford Mustang 8.8 swap.
94-04 axle from GT or Cobra (Craigslist)($300)
Rotten leonard drill guide (www.rottenleonard.com)($113)
Spherical bearings for the upper housing bushings (eBay)($76)
Adjustable upper control arms (eBay)($126)
Adapter U-joint (3-310DL) ($9) Rockauto
Driveshaft flange (2-2-939) ($27 Summit)
Cut off old spring perches and weld them on the new rear end
94-04 axle from GT or Cobra (Craigslist)($300)
Rotten leonard drill guide (www.rottenleonard.com)($113)
Spherical bearings for the upper housing bushings (eBay)($76)
Adjustable upper control arms (eBay)($126)
Adapter U-joint (3-310DL) ($9) Rockauto
Driveshaft flange (2-2-939) ($27 Summit)
Cut off old spring perches and weld them on the new rear end
#8
On the steet it will be fine as long as you use aftermarket posi unit as and axles and most importantly SET IT UP CORRECT. The set-up is what really makes parts last long and give them the strength.
The best 7.5 set-up i have seen is the 28 spline moser unit with a true trac unit and any aftermarket gears.
dura grip and eaton and auburn will still all be a major improvement over the stock carriers. ALL 28 spline.
IF you are going to the track and you hit that rear too hard the spiders will blow sky high after about 5-10 hits... IF you do round de round racing...meaning you hot lap at the drag race track. Heat up and cool down make life a lot easier on parts.
Remember too NEW ring and pinion (and really all metal parts new castings) like a break in period for hardening to happen ...The heat up and complete cool down is what rockwell the ring and pinion and it sure does not hurt the rest of the steel parts in the rear.
Good luck, Jim
J D Race
The best 7.5 set-up i have seen is the 28 spline moser unit with a true trac unit and any aftermarket gears.
dura grip and eaton and auburn will still all be a major improvement over the stock carriers. ALL 28 spline.
IF you are going to the track and you hit that rear too hard the spiders will blow sky high after about 5-10 hits... IF you do round de round racing...meaning you hot lap at the drag race track. Heat up and cool down make life a lot easier on parts.
Remember too NEW ring and pinion (and really all metal parts new castings) like a break in period for hardening to happen ...The heat up and complete cool down is what rockwell the ring and pinion and it sure does not hurt the rest of the steel parts in the rear.
Good luck, Jim
J D Race
#9
Give up
Now your saying that there is no metal wearing in a Eaton clutch. (picture provided of eaton STEEL clutches) Why do you keep this up. ALL bearings spider gears metal to metal parts will WEAR... or nothing would every WEAR OUT... silly. This is why we change the oil to clean out wear debris and get fresh oil in to help slow down the wear process and lubricate. What about pistons and crankshaft babbitt metal that they ride on wears too.... so you will never use another piston or camshaft or anything that metal rubs against.
It is so easy to refute and knock other people down. You are just making your self look silly and childish
This will be the last time will give you response on any thread you post. I do not think we all have as much time as you to stalk people.
It is so easy to refute and knock other people down. You are just making your self look silly and childish
This will be the last time will give you response on any thread you post. I do not think we all have as much time as you to stalk people.
Last edited by monzaz; October 13th, 2018 at 08:33 PM.
#10
I disagree with this. Back in the late 1980s my brother-in-law had the cone posi in his '68 GTO machined to bring it back to functionality. Several years ago I saw an online article detailing the machining process to bring them back to spec.
#11
Now your saying that there is no metal wearing in a Eaton clutch. (picture provided of eaton STEEL clutches) Why do you keep this up. ALL bearings spider gears metal to metal parts will WEAR... or nothing would every WEAR OUT... silly. This is why we change the oil to clean out wear debris and get fresh oil in to help slow down the wear process and lubricate. What about pistons and crankshaft babbitt metal that they ride on wears too.... so you will never use another piston or camshaft or anything that metal rubs against.
It is so easy to refute and knock other people down. You are just making your self look silly and childish
This will be the last time will give you response on any thread you post. I do not think we all have as much time as you to stalk people.
It is so easy to refute and knock other people down. You are just making your self look silly and childish
This will be the last time will give you response on any thread you post. I do not think we all have as much time as you to stalk people.
#12
To you sir,You are absolutely correct.It doesn't even take a machinist to do this.It can be done with some simple grinding tools and mechanical aptitude.I am guilty of performing this for customers when I was much younger.Back then there were no options.Auburn was the first to fill this void(still junk),and then finally Eaton made a quality unit.Please understand this,The internal machined stop was built into these units for a reason.As the male portion of the cone wears deeper into the female portion(diff. case half),the side gear or drive gear moves away from the little spider gears,thus the amount of tooth contact between the two becomes minimized.If you modify the unit by grinding the internal stops,You are allowing the tooth contact to become marginalized.With any apprecial power the spiders will grenade.Now even worse cenario is if you modify a Chevy or "C" clip unit,you have created a dangerous situation.As it wears further you will have enough end play in the axles to loose a "C" clip and the you loose an AXLE on a corner,would't that be fun
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