: Hello all,
:
: I need to R&R the yoke on my 8.75 gearset from
: a 7260 to 7290 yoke. I can't remember if
: this unit was built with a solid spacer or
: crush sleeve. I have not personally been
: into these gearsets before.
:
: What do you need to check after replacing the
: yoke to make sure you haven't disturbed the
: gears? Just backlash, or other settings too?
: I assume you just retorque the pinion nut to
: 240 ft-lbs?
:
: I checked the backlash and it is
: 0.010-0.011", which is a bit over spec,
: but these gears work well and the wear
: pattern is perfect.
:
: It is a 489 case with earlier clutch-style
: Suregrip and 3.91 gears - 10 spline, if that
: helps.
:
: Thanks much,
:
: Lou

: '489'is a crush-sleeve pumpkin. I'd suggest
: maybe going a little light on the torque, so
: you don't change the pinion bearing preload
: setting. Use loc-tite on the pinion nut
: threads. Try and take note of the resistance
: to rotation by hand before and after you
: change yokes. I made a tool to hold the yoke
: while you torque the pinion nut, you could
: probably get away with a 36" pipe
: wrench. Don't use a rattle gun.
: If you ever have the pumpkin out, you can put a
: solid steel spacer in and use shims like a
: '42'carrier.

: Lou, if you have a spacer it's simple. Just R&R
: the yoke, ckeck torque required to turn unit
: before and after. Start about 200lbs and
: check rotational torque, increase yoke
: torque until you get your begining
: measurement (up to 260 on the yoke is OK).
: The crush sleeve is a hassle. When reused,
: it doesn't give enough bearing preload to
: keep the pinion from climbing up the ring
: gear. The more horsepower or abuse, the
: worse it is. I have used a shim between the
: yoke and crush sleeve to further crush the
: sleeve when a new sleeve wasn't available. I
: don't know how durable that was as I sold
: the car a few months later, but it made no
: noise till then. Crush sleeves are the
: inherent weakness of 489's.
: Cecil