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Convert 253 to 308

lil_mickey

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VH 253 :-)
As the title suggest, I am swapping a 253 out to a 308 in an auto VH

(next step is to sell the car if problems persist)

I mainly need to know if the auto x-member, auto linkages and tail shaft are the same for the t400 as the trimatic.

also is there somthing anyone thinks i might have missed?
 

Stretchomatic

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it should fit no worries, provided the 308 is an aussie pattern, not a turbo pattern...pretty sure all 253's came with aussie pattern gearboxes.
 

lil_mickey

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ahh, so 308 did come out in front of trimatic?
well that will solve all probs :)
 

lil_mickey

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how long will a trimatic last behind a 308 and how much work to upgrade later?
 

ari666

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lil_mickey

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cool, thats reassuring,
sounds like this is a smaller job than i thought. :)
 

dirt drifter

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if u just do a straight 253 to 308 (trimatic bolt pattern) swap its a simple change over, unbolt the old bolt in the new.

to swap trimatic to T400, hmm this is testing the memory. u definately need a new tailshaft yoke, 99% sure u need to shorten the tailshaft and get a new x-member, i'm unsure but i doubt the stock shifter will work with a T400, just get a cheap B&M shifter off ebay or parts peddler. and if ya new 308 is trimatic bolt pattern u will need an adaptor plate kit to go a turbo pattern box.

if u are looking to upgrade to a 308 and stronger box, i would get a turbo pattern 308 and a turbo 350 box behind it. no need for adaptor kit, the stock tailshaft fits T350, all u need is a $100 crossmember and a $300 shifter (and a bigger convertor while ur at it would be nice) and ya set
 

lil_mickey

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VH 253 :-)
if u just do a straight 253 to 308 (trimatic bolt pattern) swap its a simple change over, unbolt the old bolt in the new.

to swap trimatic to T400, hmm this is testing the memory. u definately need a new tailshaft yoke, 99% sure u need to shorten the tailshaft and get a new x-member, i'm unsure but i doubt the stock shifter will work with a T400, just get a cheap B&M shifter off ebay or parts peddler. and if ya new 308 is trimatic bolt pattern u will need an adaptor plate kit to go a turbo pattern box.

if u are looking to upgrade to a 308 and stronger box, i would get a turbo pattern 308 and a turbo 350 box behind it. no need for adaptor kit, the stock tailshaft fits T350, all u need is a $100 crossmember and a $300 shifter (and a bigger convertor while ur at it would be nice) and ya set

Cheers, will prob be happening just after easter so i have a bit of time to sort it all out...
Good to know about the tail shaft with t350.
 

leigh 7005

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keep the trimatic cheap to fix cheap for parts exept stalleys dont drain power why do you think they put them behind rb30?? coz there better
 

W84N01

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VN manual, VC 5L Auto, 80series GXL 4WD :)
I have a trimatic behine my VT fuel injected 5L in my VC, and she's copped a hammering, specifically down the quarter, and i've had stuff all problems with it. Storng as andd i love having just the 3 gears............it goes like a shower of poo!!!! lol
 
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