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you need to move the drive pattern up on the gear , you have too much toe ( towards inner part of tooth ) in the pattern so you have to subtract from the shim thickness , take out .003 from the pinion shim thickness and try again and keep doing that until you arrive at a proper pattern. you will...

i use Timken 7216 or SKF 18912 or Rat 6103 from Summit racing all these are rubber seals for the 742 case ,, which seal did you order ,, the sleeve is hammered on over the yoke surface using the install tool supplied ,, if you need more info go to the speedi-sleeve website and it will show...

when you do find these antique leather seals and you want to use them , you are supposed to soak them in the oil used in the application e.g. rear axle fluid for differential seals and engine oil for rear main side seals or timing cover seals before installing the seal , this allows the leather...

why do you want to change from 2.93 to 2.76 gear , only about 180 rpm's difference ,, really not worth the time or the money to do it.

for a used gear set the pattern is right on ,, should be no issues if you had to run it ,,, but why someone would grind on the pinion that way is beyond any reasonable reason , save the shim under the pinion head bearing for your next set up , add this gear set to your scrap bin.

by chance was the axle overfilled with gear oil ,, had a similar issue with a rebuilt complete 9 inch axle i sold , all seals were leaking , turned out the customer overfilled the the unit ,,, not the 5 pints required. pull the fill plug with the car level to see if any leaks out. if not check...

are you sure the old vent wasn't broken off flush with the housing and the broken threaded part is still in there . thread size for the vents is 7/16-20 i believe.

sent you a PM with my number ,, there is one other way to go since you do not trust a e-bank transfer -- give me a call .

that one is on the shelf ready to go -- for some reason i cannot do a private message ,,so i am going to post an ad on kijiji and you can contact me there.

what gear ratio did you want and which case ,, i have some rebuilt 8-3/4 differentials 3.23 , 3.55 ,, 3.73 ,, 3.91 i am located near Windsor , Ontario and can ship. example in pic.

the early 7.25 axle you have uses pinion bearing preload shims that ranged from 0.074 - 0.106 which are pretty much obsolete now - closest shim pack is for a Dana 44 used in Jeep applications which have an O.D. of 1.450 and an I.D. of 1.140 so you would have to open up the I.D. a bit. this...

your gear pattern is perfect ,, leave it alone ,, every 8.8 i've ever done using Ford factory gears rolls the same type pattern when set up correctly. as long as your pinion bearing preload is correct as well as your carrier bearing preload you are good to go. total width of both carrier...

yes a properly rebuilt differential will have some resistance when turning ,, this is due to the preload on the pinion bearings as well as the preload on the carrier bearings ,, your gear pattern is perfect leave it alone ,, your backlash is on the low side but after you make a few runs it...

do yourself a big favour and pull the differential confirm the gear ratio and whether you have a sure grip or not and have it rebuilt as long as the gear set look good , its a 50 year old part along with the gear lube and axle bearings . clean the inside of the housing and reinstall the new...

for the 300 rpm difference between 3.23 and 3.55 gear set i do not think it is worth the time or money to change i do not think you will feel the difference , now going to maybe a 3.73 gear and you have made enough rpm difference to feel it. as far as gear company to go with see September 26...

one other thing to consider is it could be an open diff with the spider gears welded to the cross pin due to lack of lubrication -- abuse at some point in its life -- seen this too many times pull the diff to confirm what you have to be sure ,, its 50+ years old time to look.

don't want to be a bearer of bad news but your Dana gear pattern on the coast side shown in the photo looks to be way off , hope you corrected it before running that gear ,drive and coast pattern should be more like these shown on these 8-3/4 diffs i've done recently.

do this leave the bolt holding the brass brake fitting in place -- move over a couple inches and drill and tap a hole for the 7/16 -20 thread -- go to the junk yard and take a wobble cap vent off any 8.8 in the yard ( 9/16 wrench needed to remove vent from housing ) -- when you drill the hole...

your pattern is favoring the heel part of the gear on the drive side , not the best as under load the gear will walk even higher off the ring gear ,,add another .003 at a time to the pinion shim to bring the pattern down check the pattern again add more shim if necessary ,,i read all the posts...

742 case front race HM803110 is 3.500 O.D. ,, bearing cone HM803149 is 1.750 I.D. ,,741 Case front race HM89410 is 3.000 O.D. ,, bearing cone HM89446 is 1.375 I.D. -- so you are going to need a pretty big hammer to fit a 742 gear in a 741 case.

742 gears will NOT fit into a 741 case -- i do not know of any bearing you could use to do this conversion let alone the dimensional differences in the pinion itself between the 742 and 741 cases -- yokes will interchange ,, i just went thru a very nice early 657 case ( same as 741 ) with an...

8-3/4 sure grip ,, cone style used from 1969 up ,, no new parts available for this unit but if internal gears and cones are i usable shape it can be rebuilt .

make your pinion depth shim changes in .003 increments -- you are so close at .045 -- looks good as far as contact pattern on the drive side ( maybe a little low on the toe ) ,,coast side looks ok ,,so take .003 out go to .042 shim this should bring the drive side pattern up a bit to match the...

489 case i will be rebuilding had these markings on it ,, maybe of some help for someone doing a resto on their case - last picture shows remnants orange stripe near fill plug.

you can buy a repair bearing such as Timken TRP1559TV or SKF R1559 -- it places the rollers in the bearing on the unworn area of the axle shaft ,, on the 8.25 check the O.D. of the axle (area where the bearing rides) as well as the O.D. of the bearing itself to get the correct repair bearing ...

price is ok for that unit -- hopefully inside is in better shape than the outside --- i bought one of those outside stored mossy green 8-3/4 rear axles and the pics show what was inside , housing was rotted inside as well

go with the 9 inch Ford , again as stated parts availability , strength ,gear ratios in increments of 10 to help tune your car for the track you are on ,,, the Dana has its place but gear ratio selection is very limited and gear changes can be time consuming . Nascar is an excellent example of...

welding gears is a specialized procedure with specialized equipment to be done correctly ,,, but if you want to fix what you have I would simply bore the gear and sweat in a bronze bushing and finish the I.D. to the proper dimension then you have no worries about softening the gear ,, best...

best bang for the buck is the Ford Explorer rear axle -- 31 spline axles stock and lots of parts available -- easily takes 500 hp ,,,and details on narrowing are posted here on the site.,,,, next bet is a custom 9 inch Ford from Moser , Strange etc .

742 case with original power-lock sure grip ( clutch type ) has 1.800 carrier bearing journals uses bearing/ race 25590 /25520 -- if a late 1969 and up sure grip ( spring type ) was installed bearing journal is 2.000 uses bearing/ race LM 104949 / LM 104912