differential help...im at a loss - Ford Mustang Forum
 
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post #1 of 7 (permalink) Old 03-09-2013 Thread Starter
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differential help...im at a loss

I have built a 8.8 1x before never had an issue so i thought since my car is a track only car id pick up a spool and c clip eliminators and swap my 4.10 gear with an set of 4.56


i guess i should of left well enough alone

i picked up a used set of strange 33 spline with c cplip elim and a strange light weight full spool

the 4.56 gears were used in my car by the previous owner and then replaced with 3.73 and then i put the 4.10 in last year


well the install went real smooth great mesh pattern back lash about .009

well i fired her up on jack stands and let her roll.... no leaks
but when you get in 2nd or 3rd and let out of the gas knock knock knock upon acceleration fine but when you let off knock knock knock
it is coming from the diff.

well i tear it back apart set back lash a lil tight .005

fill it back up same thing this time i took it down the road same thing when i get out of it.

i did not check run out on ring gear but i pulled it up by hand

i wonder if the ring n pinion may be bad heck i dont know


88' coupe 387 ci poor boy stroker eagle 3.85 crank stock 351 rods (5.956) stock 5.0 pistons (4.00) c-4 built by PTC, 4.30 8.8 rear end 1.49 60 foot 6.99 1/8 mile 97.18 Mark Sullens E-85 carb UPR suspension
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post #2 of 7 (permalink) Old 03-09-2013
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Not saying I have an answer but does it do this when you turn by hand?


93' LX hatch, 460 w/150 plate, TH400, 9" w/ 3.60 spool. Best (so far!) of [email protected] 146 mph with 1.40 spinning 60' on steel heads
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Been saying single digit coming for 3 years.....guess I finally made it!
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post #3 of 7 (permalink) Old 03-10-2013
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Quote:
Originally Posted by stang93mustang View Post
Not saying I have an answer but does it do this when you turn by hand?
If it only does it while under pressure then my guess would be something with the lash. Just my thought. Under pressure the drive shaft is pushing the pinion forward some.

Just found this: http://www.drivetrain.com/parts_cata...tructions.html

Maybe you don't have enough lash.

93' LX hatch, 460 w/150 plate, TH400, 9" w/ 3.60 spool. Best (so far!) of [email protected] 146 mph with 1.40 spinning 60' on steel heads
Reese,
Been saying single digit coming for 3 years.....guess I finally made it!
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post #4 of 7 (permalink) Old 03-10-2013 Thread Starter
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Quote:
Originally Posted by stang93mustang View Post
Not saying I have an answer but does it do this when you turn by hand?
nope not by hand

you have to be in 2nd or 3rd about 3000-3500 rpm and let off


the back lash was .009 the first time and then i tightend it up to .005


i am wondering if there is something wrong with the gear set

i may put the 4.10 back in if it does it then it has to be the used spool or something

88' coupe 387 ci poor boy stroker eagle 3.85 crank stock 351 rods (5.956) stock 5.0 pistons (4.00) c-4 built by PTC, 4.30 8.8 rear end 1.49 60 foot 6.99 1/8 mile 97.18 Mark Sullens E-85 carb UPR suspension
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post #5 of 7 (permalink) Old 03-10-2013
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The pinion gear puts power to one side of the ring gear when you are on the gas and the other side of the gear, when you let off. My guess would be a bad ring and pinion. You have changed gears before, so I don't think the problem had anything to do with your ability.
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post #6 of 7 (permalink) Old 03-10-2013 Thread Starter
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Quote:
Originally Posted by sporty12 View Post
The pinion gear puts power to one side of the ring gear when you are on the gas and the other side of the gear, when you let off. My guess would be a bad ring and pinion. You have changed gears before, so I don't think the problem had anything to do with your ability.

Lord knows it could be me but i really think it is the gear too

i think im going to put the 4.10 back in

88' coupe 387 ci poor boy stroker eagle 3.85 crank stock 351 rods (5.956) stock 5.0 pistons (4.00) c-4 built by PTC, 4.30 8.8 rear end 1.49 60 foot 6.99 1/8 mile 97.18 Mark Sullens E-85 carb UPR suspension
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post #7 of 7 (permalink) Old 03-13-2013 Thread Starter
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im a royal dumb a$$ my "great" mesh pattern was not to great i used grease and it didnt work real well last night i went beck with permatex prussian blue and as several stated the pinion depth way way to deep ring gear had a few chips in it... shim kit ordered and the 4.10 will go back in

88' coupe 387 ci poor boy stroker eagle 3.85 crank stock 351 rods (5.956) stock 5.0 pistons (4.00) c-4 built by PTC, 4.30 8.8 rear end 1.49 60 foot 6.99 1/8 mile 97.18 Mark Sullens E-85 carb UPR suspension
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