8 3/4 Chrysler pro gears?

[jimi]

In 1988 I Decided to install a Dana 60 in my 62 dodge. I was running 11.80's @ 3700# was tired of worrying if this was my last pass on a 8 3/4 gear set, my luck it would have broke in the final at a national event. Any way I built a real 66 Dana 60 housing strange axles and spool Richmond 4:88 gears etc. never broke another part in that car. That rear differential in now in my 64 Plymouth AA/SA with a new gear set and bearings just because!
When I installed the Dana in my 62 dodge in 1988 I did it at the track (englishtown) made my first pass with the 8 3/4 , installed the Dana and drive shaft made another pass the car went .012 quicker !! My Dana was about 22# over all heavier then the 8 3/4.
I would never suggest using an 8 3/4 over a Dana 60.

FYI at the allstars race 2 weeks ago my uncle broke his 8 3/4 in his c/sa barracuda and destroyed his transmission case in the process. It is a pro trans with the band modifications etc. the case alone is 1/3 the cost of setting up a Dana 60. His car will be getting a Dana 60 this year as well.

[older racer]

hi, not to highjack this. dana came in four case sizes. the 67 to 72 ford 1/2 ton pickup is the lightest, followed by mopar case fpr B and E body cars, then 3/4 ton pickups, followed by 1 ton pickups. I changed from 8 3/4 to dana 60 years ago, I weighed both, both had spools, there was only 32 # more, with dana, the car ran exactly the same ET and MPH . the ford , has 3 " tubes, never twisted them. I used the ford case.

[sskwb]

What about the s60 version from Strange? Are they legal in stock, as strong and reliable as an old school Dana?

kurt

[Jeff Teuton]

I also have a complete Moser Dana 60 w/5.13 pro gear axle to axle. Call for more info.

[Coleydog]

All this bad vibe has made me change direction, going with Dana instead. Always heard the 8-3/4 was more efficient.

[Myron Piatek]

Originally Posted by Coleydog

All this bad vibe has made me change direction, going with Dana instead. Always heard the 8-3/4 was more efficient.

I read a dedicated article comparing rear end efficiency in one of the old car magazines a long time ago. Of the rears that I remember they tested, this was the order of efficiency:

1) GM 12 bolt
2) Dana 60
3) Chrysler 8 3/4
4) Ford 9"

I believe it said that the biggest factor is the placement of the pinion in relationship to the ring gear. The higher the pinion (closer to center), the more efficient it is. The 9" has the additional disadvantage of an extra pinion bearing.

I don't recall what others were tested.

Somebody makes/made a 12 bolt style center section for 9" housings. Was it Jim Kinnett that had a 12 bolt or a Chrysler 9 1/4 rear in his SS/AA Cuda?

[Jim Wahl]

Originally Posted by Myron Piatek

I read a dedicated article comparing rear end efficiency in one of the old car magazines a long time ago. Of the rears that I remember they tested, this was the order of efficiency:

1) GM 12 bolt
2) Dana 60
3) Chrysler 8 3/4
4) Ford 9"

I believe it said that the biggest factor is the placement of the pinion in relationship to the ring gear. The higher the pinion (closer to center), the more efficient it is. The 9" has the additional disadvantage of an extra pinion bearing.

I don't recall what others were tested.

Somebody makes/made a 12 bolt style center section for 9" housings. Was it Jim Kinnett that had a 12 bolt or a Chrysler 9 1/4 rear in his SS/AA Cuda?

Kinnett ran a 12 bolt GM rear in both the Hemi SS car and the Pro Stocker. I have seen them both personally. Jim

.

[Bob Mulry]

Originally Posted by Myron Piatek

I read a dedicated article comparing rear end efficiency in one of the old car magazines a long time ago. Of the rears that I remember they tested, this was the order of efficiency:

1) GM 12 bolt
2) Dana 60
3) Chrysler 8 3/4
4) Ford 9"

I believe it said that the biggest factor is the placement of the pinion in relationship to the ring gear. The higher the pinion (closer to center), the more efficient it is. The 9" has the additional disadvantage of an extra pinion bearing.

I don't recall what others were tested.

Somebody makes/made a 12 bolt style center section for 9" housings. Was it Jim Kinnett that had a 12 bolt or a Chrysler 9 1/4 rear in his SS/AA Cuda?

Hi,

Strange still manufactures an aluminum 12 bolt drop out center section that fits into a 9" Ford housing........

I wonder if that will pass tech (HA HA) for a GM Stock Eliminator car?????

Just sayin'

[Dwight Southerland]

Originally Posted by Myron Piatek

I read a dedicated article comparing rear end efficiency in one of the old car magazines a long time ago. Of the rears that I remember they tested, this was the order of efficiency:

1) GM 12 bolt
2) Dana 60
3) Chrysler 8 3/4
4) Ford 9"

I believe it said that the biggest factor is the placement of the pinion in relationship to the ring gear. The higher the pinion (closer to center), the more efficient it is. The 9" has the additional disadvantage of an extra pinion bearing.

It's called hypoid distance. Dana 60 is 1.125". MoPar 8 3/4, GM 12 bolt and 10 bolt, AMC Model 20 are 1.50". Ford 9" is 2.25". The farther the pinion is from the centerline of the ring gear, the greater the angle of the drive teeth to the ring gear teeth and more friction. Bearing size is a factor for efficiency as well as rotating mass.
I remember that same article, but have since learned from other sources who have done serious experimentation that the Dana 60 is more efficient than the 12 bolt.

[Todd Boyer]

Originally Posted by Myron Piatek

I read a dedicated article comparing rear end efficiency in one of the old car magazines a long time ago. Of the rears that I remember they tested, this was the order of efficiency:

1) GM 12 bolt
2) Dana 60
3) Chrysler 8 3/4
4) Ford 9"

I believe it said that the biggest factor is the placement of the pinion in relationship to the ring gear. The higher the pinion (closer to center), the more efficient it is. The 9" has the additional disadvantage of an extra pinion bearing.

I don't recall what others were tested.

Somebody makes/made a 12 bolt style center section for 9" housings. Was it Jim Kinnett that had a 12 bolt or a Chrysler 9 1/4 rear in his SS/AA Cuda?

I remember reading that Rick Johnson ran a 9 1/4 Mopar rear in his SS/AA Barracuda at one time. He may still.