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Advice wanted on installing used 258/TF999 combo

795 Views 4 Replies 3 Participants Last post by  uglyjeepoffroad
Got my tired 258 & T-5 pulled. Have a 258/TF999 as replacement(s). Replacements sold as being 'good to go', having been pulled out of '85 CJ7 getting a 4.3 swapped in.

What should I be replacing/doing to replacements while sitting on dolly/hanging from hoist? (I am NOT separating the two.) No apparent rear main or oil pan seepage, so I am not touching those either. I do intend to check the timing chain/gears.

I am thinking motor mounts, tranny mount, tranny torque bushing (or whatever the tech name for it is), ... What else? Recommendations on going w/ OE rubber or poly mounts?

Is there any kind of seal, etc. in the T/C end of the tranny that ought to be replaced? Anything between TF999 - D300 that is not present between T-5 - D300?

Easier to pull D300 and attach to tranny out of Jeep (then wrestle that long, heavy monster into Jeep or attach tranny/TC in vehicle? (BTW: What's a 258/TF999/D300 weigh altogether? 8-900 lbs?)

Anything else a tyro might miss or forget?

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Re: Advice wanted on installing used 258/TF999 com

In reply to:

Recommendations on going w/ OE rubber or poly mounts?

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Poly will last longer. but they magnify the vibes. you will feel them stitting at idle more.

I don't think you can get the whole motor/tranny/t-case in if you don't have the whole front clip (grill/radiator...) off. With the tcase atatched it is real heavy and akward to move around, but it can be done.
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