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Old 04-02-2014, 10:07 PM   #1
zpeters18
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TH400 to SM465

hello. i recently purchased a 1987 gmc 2500. it has the turbo 400 trans and np208 transfer case. i am hoping to do a manual swap on it to a sm465 trans. what all would i need to do this? thanks
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Old 04-02-2014, 10:13 PM   #2
Redcap
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Re: TH400 to SM465

Besides the trans/transfer case, you'll need to decide if you want a mech or juice clutch...the pedal kits are different. You'll also need a flywheel, clutch, pedal box, floor hump (or cut yours), linkage or hydro components. You'll also likely need some driveshaft work done. Probably some stuff I've forgotten too.
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'77 K35 - 454, SM465/NP205, 4.56 D60/14bFF
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Old 04-02-2014, 10:19 PM   #3
zpeters18
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Re: TH400 to SM465

so not necessarily 'hard' , just finding all the parts to do it
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Old 04-03-2014, 09:04 AM   #4
Rollo McFlurry
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Re: TH400 to SM465

Correct. It's easiest to have a donor truck. I would look for a transmission mated to an np205 with a fixed rear yoke. The slip yoke versions are also acceptable if you want less driveline hassle.
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Old 04-03-2014, 03:57 PM   #5
Wrenchbender Ret
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Re: TH400 to SM465

You will need a bell housing to go with the SM465. It has a larger center hole then the 3 speeds or earlier models.
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Old 04-03-2014, 05:54 PM   #6
zpeters18
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Re: TH400 to SM465

what would be easier? a manual or hydraulic clutch?
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