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08-24-2013, 07:20 PM
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#1 |
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69 K20
 Join Date: Mar 2009
Location: Elizabethtown, KY
Posts: 426
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Swapping from 4spd to TH350 issue
I'm making the swap in my 69 K20 from the manual trans and Rockwell to a TH350 with NP205 that I got from a 72. I have the automatic crossmember from the 72 but the trans mount is 2 1/4 inches off from the bracket. Has anyone done this swap? I would guess that the easiest solution is to drill the holes for the bracket into the frame. Am I right or am I missing something?
Posted via Mobile Device Posted via Mobile Device |
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08-24-2013, 08:01 PM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Swapping from 4spd to TH350 issue
Should be an easy swap. Do you have a 6 cylinder or 8 cylinder engine?
Jim
__________________
1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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08-24-2013, 08:11 PM
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#3 |
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Account Suspended
Join Date: May 2013
Location: West Linn
Posts: 163
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Re: Swapping from 4spd to TH350 issue
Yup, drill new holes, easy as that.
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08-24-2013, 08:20 PM
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#4 |
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69 K20
Join Date: Mar 2009
Location: Elizabethtown, KY
Posts: 426
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Re: Swapping from 4spd to TH350 issue
It's an 8 cylinder Jim.
Thanks 70-k5. Posted via Mobile Device |
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08-24-2013, 10:06 PM
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#5 |
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Registered User
Join Date: Aug 2012
Location: U.P. of Michigan
Posts: 115
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Re: Swapping from 4spd to TH350 issue
You need to drll new holes, because of the Rockwell transfer case to the NP205 conversion. I had to do this on my 69 going from a 4 speed/Rockwell to a 4 speed/NP205. You will a also need different length driveshafts.
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11-18-2013, 03:29 PM
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#6 |
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Registered User
Join Date: Nov 2008
Location: Midwest
Posts: 35
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Re: Swapping from 4spd to TH350 issue
Will a 454 bolt up to the Rockwell with the 4 speed 4x4?
Does anyone know what changes are needed to make this conversion? We have a 71 GMC and want to put a 454 in place of the 350. Thanks, Willie
__________________
1969 GMC 4x4, 4 speed, 350 Fleet Side in progress. 1969 Camaro SS 427 Cortez Silver. owner since 1974 1964 Chevelle 4 Door, 427 Big block,Turbo 400 1/4 Mile 10.52 @ 125.85 mph. 1.39.1 60' 1982 Crew Cab 3+3, 2WD 3.21 Locker, 468/4 speed 1969 C30 4 speed (IL6) future build. |
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