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Author Topic: swapping 267/th350 to 350/th400  (Read 8409 times)

Offline gold84gmc

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swapping 267/th350 to 350/th400
« on: July 24, 2011, 11:48:23 am »
my dads truck (77 gmc stepside 2wd) had a 267 with a th350, were building a 350 to put in it, and we have a th400 that we wanna put in it, can we just put the th400 in with no mods or do we have to change the cross member and/or driveshaft, it has a one piece drive shaft
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Offline VileZambonie

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Re: swapping 267/th350 to 350/th400
« Reply #1 on: July 24, 2011, 11:54:42 am »
That all depends on the tailshaft length. Too many variables so just measure it.
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Offline gold84gmc

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Re: swapping 267/th350 to 350/th400
« Reply #2 on: July 24, 2011, 12:08:39 pm »
if they are different, can we swap the one from the th350 on to the th400?
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Offline zieg85

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Re: swapping 267/th350 to 350/th400
« Reply #3 on: July 24, 2011, 02:42:51 pm »
Is the 4.3L and V-8 or V-6?
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1985 C20 Scottsdale 7.4L 4 speed 3.21
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Offline gold84gmc

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Re: swapping 267/th350 to 350/th400
« Reply #4 on: July 24, 2011, 02:46:25 pm »
what?
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Offline bigchevyc30

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Re: swapping 267/th350 to 350/th400
« Reply #5 on: July 24, 2011, 07:29:56 pm »
hes asking is your motor a v-6 or a v-8
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1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4

Offline gold84gmc

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Re: swapping 267/th350 to 350/th400
« Reply #6 on: July 24, 2011, 08:56:12 pm »
267 v8
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Offline WilliamBos

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Re: swapping 267/th350 to 350/th400
« Reply #7 on: July 24, 2011, 09:15:29 pm »
Quote from: zieg85 on July 24, 2011, 02:42:51 pm
Is the 4.3L and V-8 or V-6?

The 4.3 is 262.

Measure the trans, you may need a shorter drive shaft.
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Offline zieg85

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Re: swapping 267/th350 to 350/th400
« Reply #8 on: July 24, 2011, 09:38:31 pm »
Quote from: WilliamBos on July 24, 2011, 09:15:29 pm
Quote from: zieg85 on July 24, 2011, 02:42:51 pm
Is the 4.3L and V-8 or V-6?

The 4.3 is 262.

Measure the trans, you may need a shorter drive shaft.

Yes and the 267 is also considered a 4.3L.  I only asked the question because the frame mounts are different for the V-6...  Kick down is electric on a TH400
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Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline WilliamBos

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Re: swapping 267/th350 to 350/th400
« Reply #9 on: July 24, 2011, 10:35:08 pm »
Quote from: zieg85 on July 24, 2011, 09:38:31 pm
Quote from: WilliamBos on July 24, 2011, 09:15:29 pm
Quote from: zieg85 on July 24, 2011, 02:42:51 pm
Is the 4.3L and V-8 or V-6?

The 4.3 is 262.

Measure the trans, you may need a shorter drive shaft.

  Kick down is electric on a TH400


No TV cable like the TH350??
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Offline VileZambonie

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Re: swapping 267/th350 to 350/th400
« Reply #10 on: July 25, 2011, 08:59:15 pm »
The TH350 has a detent cable, the TH400 has a detent solenoid, the TH700R4 has a TV cable.
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Offline gold84gmc

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Re: swapping 267/th350 to 350/th400
« Reply #11 on: July 26, 2011, 10:24:49 am »
if it has a solenoid shouldnt it have a plug for a connector?, the th400 we have doesnt any connectors on it
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Offline bigchevyc30

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Re: swapping 267/th350 to 350/th400
« Reply #12 on: July 26, 2011, 08:10:56 pm »
agreed i my truck has the th400 and i have only a vacuum hose going to it and the shifting linkage
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1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4

Offline VileZambonie

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Re: swapping 267/th350 to 350/th400
« Reply #13 on: July 26, 2011, 09:52:23 pm »
disagreed,

see image

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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline bigchevyc30

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Re: swapping 267/th350 to 350/th400
« Reply #14 on: July 26, 2011, 11:12:36 pm »
so then whats the wire that hooks up for then and what would it do with out it hooked up cause i would like to know and on how i would wire it up. thanks for showing that vile i seem to learn something new about my truck every day
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1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4
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