L27 to L36 swap? anyone?
05-17-2006, 01:16 PM
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L27 to L36 swap? anyone?
i've got a '95 transport which basicly has a '94 bonneville drivetrain in it. it'* an L27/4t60E combo thats got about 170K on it. the original play was to drop a S2 L-67 in and blow everything away with this monster sleeper. but i've decided instead to build an old monza drag car instead and use the van as a support vehicle. which of course means towing and the like.
i'd love to have that extra 35 horse the L36 provides, not to mention the torque for just tooling around town and definatly for towing.
has anyone ever done a 27 to 36 swap before. i figure the mounts should match up and my biggest problem would be the wiring. my plan here is to get the factory wiring harness from both cars and just compare them, eventually plicing them into a perfect adaptor harness. this will take me weeks.
i figure i might also have to swap axels, since i'd like to use whatever tranny comes with the L36.
anyone done this before?
i'd love to have that extra 35 horse the L36 provides, not to mention the torque for just tooling around town and definatly for towing.
has anyone ever done a 27 to 36 swap before. i figure the mounts should match up and my biggest problem would be the wiring. my plan here is to get the factory wiring harness from both cars and just compare them, eventually plicing them into a perfect adaptor harness. this will take me weeks.
i figure i might also have to swap axels, since i'd like to use whatever tranny comes with the L36.
anyone done this before?
05-17-2006, 03:18 PM
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No I have not done this before...
But after driving the LN3'* and L27'* I will say that the L36 does not have the Super strong low end grunt that the LN3 and L27 has... But the L36 does have a nice and stout 200 ft lbs at say 1500 rpms and a peak of 230 @ 4000 rpms, with 205 HP at 5200 Rpms... It does get to be a bit more fun above 3500 rpms...
But I do feel with a bit of an exahust, and intake, and some lower intake porting an L36 will be more than up to the challenge of towing and moving the Transport around.... The 3800 should have continued in the U body line through current... Thats just my thought..
Family member has a Montanna and wishes it had the same 3800 II L36 that his 95 Bonneville has...
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But after driving the LN3'* and L27'* I will say that the L36 does not have the Super strong low end grunt that the LN3 and L27 has... But the L36 does have a nice and stout 200 ft lbs at say 1500 rpms and a peak of 230 @ 4000 rpms, with 205 HP at 5200 Rpms... It does get to be a bit more fun above 3500 rpms...
But I do feel with a bit of an exahust, and intake, and some lower intake porting an L36 will be more than up to the challenge of towing and moving the Transport around.... The 3800 should have continued in the U body line through current... Thats just my thought..
Family member has a Montanna and wishes it had the same 3800 II L36 that his 95 Bonneville has...
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05-17-2006, 04:20 PM
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jr's3800, his L27 has a 4T60E trans and many L36'* do also. are they the same bellhousing/mounting pattern or do you have to get the trans with the motor?
05-17-2006, 04:29 PM
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It will bolt up, but some internal wiring changed from year to year. A good trans shop could convert it for another year.
Personally, I'm all for the direction jr's3800 was almost leaning in his reply. I think the L27 is better suited for towing than the L36. Simply because it delivers it'* peak power at a lower RPM.
Personally, I'm all for the direction jr's3800 was almost leaning in his reply. I think the L27 is better suited for towing than the L36. Simply because it delivers it'* peak power at a lower RPM.
05-17-2006, 05:08 PM
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we need to keep in mind that the L27 has the Tall deck and the L36 has the short deck... But the way in which these motors produce their torque is diffrent...
My LN3 is instant torque.... Its amazing to see it strum along at 1400-1450 rpms going uphill and loose no speed in OD... The L27 is much the same in that respect but it got the aid of better breathability and a few changes that helped reduce friction even further... I would most likely stick with the L27 if you plan on towing 3000-4000 Lbs...
Yes everyone I know that amount of towing is not reccomended, But we all know the 3800 can do it... I would merely suggest a good trans cooler for towing..
Now if you want to drop in a lower milage L36 I'm all for that too... More top end power there... It would be interesting to see a Transport running around with the engine I think it should have had all along( especially 96 )
And being off the wall here...
I wonder if the 94 U body PCM wiring harness is the same, as the PCM for the 94-95 Bonnevilles are the same as the 94-95 U body van... An L36 may turn into an easy swap if the wiring is right and you can get your hands on an L36 EPROM for the PCM...
Does the 94-95 L27 have the double knock sensor set up?
and yes the 3800 II L36 will bolt right up to the present trans
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My LN3 is instant torque.... Its amazing to see it strum along at 1400-1450 rpms going uphill and loose no speed in OD... The L27 is much the same in that respect but it got the aid of better breathability and a few changes that helped reduce friction even further... I would most likely stick with the L27 if you plan on towing 3000-4000 Lbs...
Yes everyone I know that amount of towing is not reccomended, But we all know the 3800 can do it... I would merely suggest a good trans cooler for towing..
Now if you want to drop in a lower milage L36 I'm all for that too... More top end power there... It would be interesting to see a Transport running around with the engine I think it should have had all along( especially 96 )
And being off the wall here...
I wonder if the 94 U body PCM wiring harness is the same, as the PCM for the 94-95 Bonnevilles are the same as the 94-95 U body van... An L36 may turn into an easy swap if the wiring is right and you can get your hands on an L36 EPROM for the PCM...
Does the 94-95 L27 have the double knock sensor set up?
and yes the 3800 II L36 will bolt right up to the present trans
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05-17-2006, 07:29 PM
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Re: L27 to L36 swap? anyone?
Originally Posted by Marik_bathory
i've got a '95 transport which basicly has a '94 bonneville drivetrain in it. it'* an L27/4t60E combo thats got about 170K on it. the original play was to drop a S2 L-67 in and blow everything away with this monster sleeper. but i've decided instead to build an old monza drag car instead and use the van as a support vehicle. which of course means towing and the like.
i'd love to have that extra 35 horse the L36 provides, not to mention the torque for just tooling around town and definatly for towing.
has anyone ever done a 27 to 36 swap before. i figure the mounts should match up and my biggest problem would be the wiring. my plan here is to get the factory wiring harness from both cars and just compare them, eventually plicing them into a perfect adaptor harness. this will take me weeks.
i figure i might also have to swap axels, since i'd like to use whatever tranny comes with the L36.
anyone done this before?
i'd love to have that extra 35 horse the L36 provides, not to mention the torque for just tooling around town and definatly for towing.
has anyone ever done a 27 to 36 swap before. i figure the mounts should match up and my biggest problem would be the wiring. my plan here is to get the factory wiring harness from both cars and just compare them, eventually plicing them into a perfect adaptor harness. this will take me weeks.
i figure i might also have to swap axels, since i'd like to use whatever tranny comes with the L36.
anyone done this before?
05-17-2006, 08:41 PM
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Re: L27 to L36 swap? anyone?
Originally Posted by GAMEOVER
Originally Posted by Marik_bathory
i've got a '95 transport which basicly has a '94 bonneville drivetrain in it. it'* an L27/4t60E combo thats got about 170K on it. the original play was to drop a S2 L-67 in and blow everything away with this monster sleeper. but i've decided instead to build an old monza drag car instead and use the van as a support vehicle. which of course means towing and the like.
i'd love to have that extra 35 horse the L36 provides, not to mention the torque for just tooling around town and definatly for towing.
has anyone ever done a 27 to 36 swap before. i figure the mounts should match up and my biggest problem would be the wiring. my plan here is to get the factory wiring harness from both cars and just compare them, eventually plicing them into a perfect adaptor harness. this will take me weeks.
i figure i might also have to swap axels, since i'd like to use whatever tranny comes with the L36.
anyone done this before?
i'd love to have that extra 35 horse the L36 provides, not to mention the torque for just tooling around town and definatly for towing.
has anyone ever done a 27 to 36 swap before. i figure the mounts should match up and my biggest problem would be the wiring. my plan here is to get the factory wiring harness from both cars and just compare them, eventually plicing them into a perfect adaptor harness. this will take me weeks.
i figure i might also have to swap axels, since i'd like to use whatever tranny comes with the L36.
anyone done this before?
Even a 92/93 L67 has enough torque to go around plus it is at a super low peak
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