I was thinking of replacing my tired 2.8 GM engine in my 85 XJ with the HT
3.4 GM replacement, but I found a complete running 4.0 from a 92 XJ. Even
with the cost of rebuilding the 4.0 it would cost me the same amount.
Problem is that the 92 XJ was hit in the front so I can't get decent
measurements to see if I can fit it in my 85 XJ. Anyone know if it will
transfer?

Thanks.
Eric

 

It will not fit. They changed the firewall size for the 4.0.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Eric Shade wrote:
>
> I was thinking of replacing my tired 2.8 GM engine in my 85 XJ with the HT
> 3.4 GM replacement, but I found a complete running 4.0 from a 92 XJ. Even
> with the cost of rebuilding the 4.0 it would cost me the same amount.
> Problem is that the 92 XJ was hit in the front so I can't get decent
> measurements to see if I can fit it in my 85 XJ. Anyone know if it will
> transfer?
>
> Thanks.
> Eric

 

It will not fit. They changed the firewall size for the 4.0.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Eric Shade wrote:
>
> I was thinking of replacing my tired 2.8 GM engine in my 85 XJ with the HT
> 3.4 GM replacement, but I found a complete running 4.0 from a 92 XJ. Even
> with the cost of rebuilding the 4.0 it would cost me the same amount.
> Problem is that the 92 XJ was hit in the front so I can't get decent
> measurements to see if I can fit it in my 85 XJ. Anyone know if it will
> transfer?
>
> Thanks.
> Eric

 

It will not fit. They changed the firewall size for the 4.0.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Eric Shade wrote:
>
> I was thinking of replacing my tired 2.8 GM engine in my 85 XJ with the HT
> 3.4 GM replacement, but I found a complete running 4.0 from a 92 XJ. Even
> with the cost of rebuilding the 4.0 it would cost me the same amount.
> Problem is that the 92 XJ was hit in the front so I can't get decent
> measurements to see if I can fit it in my 85 XJ. Anyone know if it will
> transfer?
>
> Thanks.
> Eric

 

It will not fit. They changed the firewall size for the 4.0.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Eric Shade wrote:
>
> I was thinking of replacing my tired 2.8 GM engine in my 85 XJ with the HT
> 3.4 GM replacement, but I found a complete running 4.0 from a 92 XJ. Even
> with the cost of rebuilding the 4.0 it would cost me the same amount.
> Problem is that the 92 XJ was hit in the front so I can't get decent
> measurements to see if I can fit it in my 85 XJ. Anyone know if it will
> transfer?
>
> Thanks.
> Eric

 

> It will not fit. They changed the firewall size for the 4.0.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
Thanks for the quick response. Just looking at the length of the engine it
diddn't look like it. I was hoping though, in my opinion the straight 6 is
a better engine than the V.

Eric

 

> It will not fit. They changed the firewall size for the 4.0.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
Thanks for the quick response. Just looking at the length of the engine it
diddn't look like it. I was hoping though, in my opinion the straight 6 is
a better engine than the V.

Eric

 

> It will not fit. They changed the firewall size for the 4.0.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
Thanks for the quick response. Just looking at the length of the engine it
diddn't look like it. I was hoping though, in my opinion the straight 6 is
a better engine than the V.

Eric

 

> It will not fit. They changed the firewall size for the 4.0.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
Thanks for the quick response. Just looking at the length of the engine it
diddn't look like it. I was hoping though, in my opinion the straight 6 is
a better engine than the V.

Eric

 

I agree, since this is my daily driver, I don't want to have it out of
commision that long just to shoe horn the engine in and it would never be
properly mounted.

Eric

> It may well be a better engine but the amount of firewall and motor mount
> hacking needed do not make it a trivial swap. Yes, you could do it and I
recall
> seeing some web sites that discussed it. But frankly it's such a
complicated
> job that it's probably not worth it.
>