Re: 8 3/4 help
[Re: dakotaman]
#3216385
02/26/24 04:07 PM
02/26/24 04:07 PM
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Joined: May 2003
Posts: 3,139 N.W. Florida
Fat_Mike
master
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master
Joined: May 2003
Posts: 3,139
N.W. Florida
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Hello all, I am building a Dodge Dakota. I have installed a E Body 8 3/4. It has a 489 case, that came out of a 73 D150. It is a sure grip. I had someone put a Richmond 3.90 gear set in it.
With the truck up in the air both tires will spin together in the same direction as one would expect. When trying to do a burnout I am only getting one tire to spin. I'm assuming the clutches are wore out, but I don't know enough about them. Could it be something else such as axle bearing preload? It is the only thing I can think of other than the clutches are junk. Is there a way to check the clutches without taking it apart?
I've not delt with the rearend gears much, and with the local guys wanting an arm and a leg to fix what I have I think I may try it myself. If the clutches are a pain, I may just install a spool.
Thanks in advance, Sean Have you changed the gear oil, and if so, did you add friction modifier?
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Re: 8 3/4 help
[Re: dakotaman]
#3216407
02/26/24 05:33 PM
02/26/24 05:33 PM
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Joined: Jan 2003
Posts: 75,126 A Banana Republic near you.
JohnRR
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Hello all, I am building a Dodge Dakota. I have installed a E Body 8 3/4. It has a 489 case, that came out of a 73 D150. It is a sure grip. I had someone put a Richmond 3.90 gear set in it.
With the truck up in the air both tires will spin together in the same direction as one would expect. When trying to do a burnout I am only getting one tire to spin. I'm assuming the clutches are wore out, but I don't know enough about them. Could it be something else such as axle bearing preload? It is the only thing I can think of other than the clutches are junk. Is there a way to check the clutches without taking it apart?
I've not delt with the rearend gears much, and with the local guys wanting an arm and a leg to fix what I have I think I may try it myself. If the clutches are a pain, I may just install a spool.
Thanks in advance, Sean I'm going to assume it still has the cone type sure grip , if so that is your problem , they are not designed to be rebuilt , they can be machined so the cones are not bottoming out but it's only going to happen again. They are garbage by design , they grind themselves into tiny chips of metal everytime it goes around a corner. There is a Korean sourced copy of the dana/spicer clutch type that's less than 300 and I've heard good things about it , save yourself and just get that.
running up my post count some more .
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Re: 8 3/4 help
[Re: Fat_Mike]
#3216420
02/26/24 06:13 PM
02/26/24 06:13 PM
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Joined: Feb 2010
Posts: 5 IL
dakotaman
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IL
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Hey Fat_Mike, I probably have 5 miles on it and yes, I added Friction additive when I filled it. I've only driven it down the road a few times to shake it down. Thanks
Last edited by dakotaman; 02/26/24 06:17 PM.
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Re: 8 3/4 help
[Re: dakotaman]
#3216460
02/26/24 09:21 PM
02/26/24 09:21 PM
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Joined: Jan 2003
Posts: 75,126 A Banana Republic near you.
JohnRR
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JohnRR, How do you tell if it is the cone type? I will google search it. I will probably pull the center section this upcoming weekend.
Thanks Who put the gears in it ? Now that the gears are setup it's not to hard to change out the diff , check current backlash setting and reset the backlash after you change the diff. You'll need new bearings for the diff. Look at the link above , the cone type is the top picture , it is easily identified by the springs in the window.
running up my post count some more .
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Re: 8 3/4 help
[Re: dakotaman]
#3216475
02/26/24 10:10 PM
02/26/24 10:10 PM
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Joined: Aug 2003
Posts: 43,364 Bend,OR USA
Cab_Burge
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Bend,OR USA
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I put a 35 spline spool and axles in my old pump gas Duster, I used an early(1964 Dodge B body) B body 8 3/4 housing and had it cut down to be 2 inches narrower than the stock Duster 8 3/4 housing. I built that car to race the blacks guys in Los angles on the streets It was a ladder bar car with coil over rear suspension, stock gas tank. it was a little bit of a pain to back up while making a sharp turn to back into a parking spot that had a lot of cars in the lot, same thing on going forward around tight corners. Other than that it was good I didn't have back brace put on that housing and I ended up bending the passenger axle side of the housing really badly, it broke the welds of the housing ladder bar mounts off of the housing doing a burn out That was really lucky for me, if it had broken while racing or driving it on the streets it I may have lost control and wreck the car I bought used Dana 60 3/4 ton pickup housing out of a junkyard that had one ruin end on it by spinning one outer wheel bearing inner race, I had it narrowed and put new ends on it and love it from day one I used a spool in it also IHTHs
Last edited by Cab_Burge; 02/26/24 10:15 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 8 3/4 help
[Re: JohnRR]
#3216485
02/26/24 11:13 PM
02/26/24 11:13 PM
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Joined: Jan 2003
Posts: 15,567 Omaha Ne
TJP
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Omaha Ne
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JohnRR, How do you tell if it is the cone type? I will google search it. I will probably pull the center section this upcoming weekend.
Thanks Who put the gears in it ? Now that the gears are setup it's not to hard to change out the diff , check current backlash setting and reset the backlash after you change the diff. You'll need new bearings for the diff. Look at the link above , the cone type is the top picture , it is easily identified by the springs in the window. I will add to check the back lash in 3 or 4 positions noting them on the gear, try to get as close as possible the the existing numbers
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Re: 8 3/4 help
[Re: dakotaman]
#3216541
02/27/24 09:34 AM
02/27/24 09:34 AM
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Joined: Jan 2003
Posts: 13,417 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
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Marion, South Carolina [><]
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There's nothing wrong w/ a spool on the street. Slow speed turns require a little more effort and pushing the car while turning is difficult. Other than that, you'll probably never notice a difference. Don't believe the myths about wet roads and curves are dangerous w/ a spool.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: 8 3/4 help
[Re: Pacnorthcuda]
#3216645
02/27/24 03:22 PM
02/27/24 03:22 PM
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Joined: Jan 2003
Posts: 1,030 NJ
EV2RTSE
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Re: 8 3/4 help
[Re: EV2RTSE]
#3216673
02/27/24 05:53 PM
02/27/24 05:53 PM
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Joined: Jan 2003
Posts: 75,126 A Banana Republic near you.
JohnRR
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I would not buy the china one on amazon. I'll see the guy that told me about the Korean sourced one and find out exactly which it is . Dr. Diff is doing something extra to the ones he is selling so that would cost extra over his cost to buy the unit These are not the same units offered by others. I blueprint the clutch tension with hardened shims I produce myself.
running up my post count some more .
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Re: 8 3/4 help
[Re: roadrunninMark]
#3217930
03/04/24 08:52 AM
03/04/24 08:52 AM
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Joined: Jan 2003
Posts: 75,126 A Banana Republic near you.
JohnRR
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Hi JohnRR, do you have anymore info on the Korean diff copy? Did a google search and got some weird results but not what I was looking for. I talked to the guy that told me about this diff , it's not Korean it's supposed to be made in Finland by an OEM manufacturer but looking at it and all the other cheap chinese clutch type sure grips they all appear to be from the same casting mold , at least the end the ring gear is bolted to all have the same numbers in the same orientation ??? He seems to like these and says they are better than the 199 cheap chinese junk ones people have brought him , lots of clean up and deburring to get the ring on and the bearings go on harder ??? He thinks this is the same one Mancini is selling ? Anyway this is it , you decide ... I think I would spend the money on a Dr. diff sourced unit . ebay clutch type
running up my post count some more .
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Re: 8 3/4 help
[Re: EV2RTSE]
#3217933
03/04/24 08:58 AM
03/04/24 08:58 AM
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Joined: Jan 2003
Posts: 75,126 A Banana Republic near you.
JohnRR
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After looking at clutch types last night , the amazon one is the same as the ebay one I posted .... price is basically the same ... which comes highly recommended by the local guy to me that is the go to for the area to have rears and 833's rebuilt ... I sold him 7 of the 9 8.75 chucks/housing I was off loading to downsize , he certainly didn't need anymore and gave me more than I asked for . https://www.ebay.com/itm/256386635980I still think I would spend the extra and get the dr. diff unless it was something I was going to sell soon ... Anywho they all look like this on the end ...
Last edited by JohnRR; 03/04/24 09:03 AM.
running up my post count some more .
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