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Unread 06-18-2003, 10:56 PM   #1
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Join Date: Oct 2002
Posts: 48
258 to 304 swap

i had a question about mounting the transmission to a 304. Since it was on a 258 ive heard that the block of a inline six is longer than the 304. I was told that i would have to bring the transmission forward so it will fit onto the engine. Not sure just checkin with everybody that has done the swap

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Unread 06-19-2003, 08:42 AM   #2
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1978 CJ7 
Join Date: Jan 2003
Location: Lancaster, Pa.
Posts: 1,759
were you skid plate bolts on should be a line of holes in the frame move to what ones you need i did a 79 cj 5 and had no problem years ago
1978 cj-7 had since 1979
401 .030 over- full floating flat top pistons
crower solid cam 292 dur .500/.510 lift
turbo 400 tranny 2500 stall
model 20 transfer case
aj delux glass body
4" lift
dana 30 frount
dana 44 rear
4.56 gears
13.461 @ 92.45 mph on 37" super swampers on 1/4 mile
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Unread 06-19-2003, 09:38 AM   #3
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Location: Colorado
Posts: 14,585
That is false info. The transmission should stay in the same place and the motor mounts will bolt right up to the frame when the V8 is dropped in. Yes the I6 block is slightly longer, but there is just more room in front of the fan on a V8. The extra holes in the skidplates are there for the different transmissions that were available in any given year CJ. A V8 CJ with a T150 transmission has the tranny/tcase in the exact same spot as a I6 CJ with a T150.
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