69 442 posi-traction
#1
69 442 posi-traction
I have a 69 442. It does not have a posi traction diff. I was thinking of putting one in and was wondering the rough cost. I don't know if I really need it. Would I be better off spending the money on disk brakes.Any opinions appreciated. Thanks
#2
Hi,
As long as your not changing gears, posii, carrier bearings and maybe axle seals should be all the cost involved, depending on how many mile miles you have on it, pinion bearing and seal would be the other cost depending on condition.
Regards,
As long as your not changing gears, posii, carrier bearings and maybe axle seals should be all the cost involved, depending on how many mile miles you have on it, pinion bearing and seal would be the other cost depending on condition.
Regards,
#4
Your car likely has an O-Type rearend, so the choice of limited slip differentials is very limited (ha, there's a pun!)
The choices are:
1) used GM or
2) aftermarket machined Ford 8.8.
Be aware that the Ford 8.8 works only with 3.08-3.23 gear ratios, anything else would need a used GM differential.
The choices are:
1) used GM or
2) aftermarket machined Ford 8.8.
Be aware that the Ford 8.8 works only with 3.08-3.23 gear ratios, anything else would need a used GM differential.
#6
I was amazed when I learned back in the 80s that many performance cars didn't have a limited slip diff, even though it was a very inexpensive option when these cars were new. Also amazing to me was that my 1970 Cutlass Supreme with a 2.56 rear had a limited slip diff, when many 442s didn't get one.
#7
My '68 4-4-2 came with a 3.08 limited slip differential. My '69 4-4-2 came with a 3.23 open differential. I converted the 3.23 to limited slip but I didn't do the work. Parts were around $800. Labor was another $500. That was done in 2015. I don't notice any difference in adding limited slip to the '69. I don't push either car hard at all. If I had it to do over again, I'd probably keep the $1300 in my pocket. Both cars have THM 400 transmissions. I got my limited slip kit from Supercarsunlimited.com.
Randy C.
Randy C.
Last edited by rcorrigan5; June 30th, 2019 at 12:45 PM. Reason: noticing any difference; transmission type for each car; where I got my limited slip kit
#8
I can see the rationales already shared by others as to why you might consider not going through the cost of adding the posi feature. That said, I own a 70-442 4 speed w/posi. If you have never felt the difference of sitting dead still or slowly rolling to the left while fully in gauging the gas pedal and feeling both tires begin to dance while soon after shifting into 2nd gear is a different feel of fun vs a non posi rear end in play. I don't do it often in my restored ride, but its a sensation that every muscle car fan should feel at least once.
Last edited by capstoneclub; June 30th, 2019 at 03:29 AM.
#10
Last edited by JohnnyBs68S; June 30th, 2019 at 12:38 PM.
#11
That's not true, I have a Richmond 3.90 on a modified Ford 8.8 w/ 28 spline axles in my '68 Type-O rear. Supercars Unlimited offer a variety of diffs for the Type-O.
#12
You are correct, I didn't state that accurately. I was referring to the original poster's factory gears in his O-Type. The Richmond Gear ring gears are manufactured with the same thickness as the original 3.08-3.23 GM gear sets, so they work with a differential made for the original 3.08-3.23 gears.
#13
You are correct, I didn't state that accurately. I was referring to the original poster's factory gears in his O-Type. The Richmond Gear ring gears are manufactured with the same thickness as the original 3.08-3.23 GM gear sets, so they work with a differential made for the original 3.08-3.23 gears.
#14
69-70 Olds 12 Bolt O Axle Carrier
Item #: 46-150Description:
1969-1970 Oldsmobile 12 Bolt O Axle carrier for use with factory 3.42 thru 5.00 Ring & Pinion gear sets. Special Order Only. Please call.
Price:$0.00
Special Order Only - Please Call
Last edited by JohnnyBs68S; July 1st, 2019 at 09:20 AM.
#16
I would interpret the special order to mean a Ford 8.8 diff would be machined so the ring gear pad is thicker to accommodate the factory gears. Just speculation on my part, though. I'm sure monzazz or Brian Trick could enlighten us, if they were to read this topic.
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September 16th, 2011 11:08 AM