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Reinforcing the transfer-case and gearbox
mounts is usually a good idea in general on Nivas, as the vibrations caused from
having a separate gearbox and transfer-case can tear through the relatively thin
steel of the floor that they're bolted to. Strengthening plates sandwich in between
the mounts and the floor and are a easy do-it-yourself (especially if you're
already removing or realigning the transfer-case). Note you can't use very
thick metal for these sandwich plates as it may move the gearbox and transfer-case
downwards too much.
Transfer-case mount floor upgrades
My own version of the Paris-Dakar gearbox mount modification; the transfer-case has exactly the same done to it — I drilled out the factory studs and made a thick steel plate put bigger studs (bolts) through two holes and welded them to the plate, these studs now drop down through two holes in the floor. I had intended to also weld the plates to the floor, but this hasn't proved necessary yet (once the greabox and transfer-case are bolted in place there's no movement).
Many people have tried braces to stabilise the transfer-case and minimise its movement (which causes vibrations). I've not tried these so I can't vouch for them.
Note: you should only really use a brace as a last resort solution to transmission vibrations and shudders — go through the usual alignment and vibration solving processes first, or you'll very likely just be masking a problem that will come back to bite you.
Here's a variety of different approaches...
Mk3 (Chevrolet) Niva factory "fix"
Likewise, double mounting transfer-cases is another popular way of minimising its excessive up-and-down rotational movement.
Transfer-case Carriers and Cradles
Cradles or carriers that hold the transfer-case from underneath are popular (to either help with vibrations or to replace weak/missing/stripped original mounting bolts). These can include double mounts or a third moiunt to help minimise movements.
Madman's DIY transfer-case cradle; the box section that holds it in place means this design doesn't need crush-tubes (ie to stop the chassis crusing when you tighten the bolts up) through the chassis. They could also be extended to become armour for the chassis rails.
A commonly available Russian after-market trandfer-case cradle; this includes a mout on the gearbox mount to minimise movement in that direction.
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