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Started By
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6.6L gas L8T swap into a 1500. Has anyone here done this.
Posted on 7/25/26 at 10:47 am
Posted on 7/25/26 at 10:47 am
The gas 6.6 without AFM is appealing to me. Everything I've read states it's a straight up drop in with minimal items that need to be addressed. I plan to purchase the engine complete with everything, intake/throttle body, even exhaust manifolds. The engine is from GM
Any experience is welcomed.
Any experience is welcomed.
2
Posted on 7/25/26 at 11:11 am to wrongRob
No experience here but are you upgrading the transmission and axles as well?
Posted on 7/25/26 at 2:37 pm to bbvdd
Yes on the transmission it's already been rebuilt but will and additional cooling for it as well.
I haven't read or been advised on the axles haven't been concerned about them until now.
I haven't read or been advised on the axles haven't been concerned about them until now.
Posted on 7/25/26 at 2:48 pm to wrongRob
May need to get a new driveshaft if the pinion flange to output shaft of the tranny/transfer case distance changed much. If not, a conversion ujoint or yoke may be needed if the one for the new tranny is different than your old one. May not necessarily “have to” change axles, but I would think suspension components would need to be upgraded to accommodate the heavier engine and tranny.
I would also make sure your current computer is compatible, with the swap to ensure all your gauges and shite still function normally.
I would also make sure your current computer is compatible, with the swap to ensure all your gauges and shite still function normally.
This post was edited on 7/25/26 at 2:51 pm
Posted on 7/25/26 at 2:55 pm to Soul Gleaux
The block is identical outside of it being iron. I'm not sure anything needs to change there. I could be wrong, I'll definitely look into to it.
Posted on 7/25/26 at 2:58 pm to wrongRob
I’m not a chevy guy, but what engine/tranny combo are you swapping from? And what is the new tranny?
Posted on 7/25/26 at 2:59 pm to wrongRob
quote:
straight up drop in with minimal items that need to be addressed.
I havent done it before but this is likely accurate
Posted on 7/25/26 at 3:01 pm to Soul Gleaux
The beauty of the swap is it all stays the same except the engine going from 5.3 gen 5 L83 to 6.6 GEN 5 L8T
Posted on 7/25/26 at 3:09 pm to wrongRob
quote:
The beauty of the swap is it all stays the same except the engine going from 5.3 gen 5 L83 to 6.6 GEN 5 L8T
Nice. Doubt you’ll run into any of the stuff I listed then
Posted on 7/25/26 at 3:12 pm to Soul Gleaux
Well you know they always go to commercial break when it's time for the nut cuttin. 
Posted on 7/25/26 at 3:17 pm to Soul Gleaux
I actually was concerned about the weight. However thats a non-issue considering the amount of material they have to remove to make it a 6.6L. The difference of the finished product is roughly 40lbs or similar.
Posted on 7/25/26 at 3:21 pm to DownshiftAndFloorIt
One can hope. I did a classic Camaro years ago. Purchased some Dart pro1 platinum heads. They had flash like potatoe chips in them. Hilarious not so much for the cost. Had them matched to the intake anyway but you know they were "bolt on" and all. 
Posted on 7/25/26 at 3:42 pm to wrongRob
quote:
I actually was concerned about the weight. However thats a non-issue considering the amount of material they have to remove to make it a 6.6L. The difference of the finished product is roughly 40lbs or similar.
Craziest difference I came across in my swap was having my factory small block E4OD tranny built for a high performance big block. Having some of the beefier 4R100 parts and the triple billet torque converter seemed like it tripled it in weight.
Posted on 7/25/26 at 3:55 pm to Soul Gleaux
There has been mention of using a triple billet torque converter but I plan on using the stock cam if I can be disciplined :) so I shouldn't need one.
How did you like the converter after using it?
BTW you mentioned the computer, it works with the new motor need to get an adapter for one of the connections for the fuel or take it off the 5.3
How did you like the converter after using it?
BTW you mentioned the computer, it works with the new motor need to get an adapter for one of the connections for the fuel or take it off the 5.3
Posted on 7/25/26 at 4:05 pm to wrongRob
It’s awesome, gets every ounce of the 700+ ft-lbs of torque to the wheels immediately. Pins you to the seat when you hammer it.
ETA: can’t recommend the builder enough (Brian’s Truck Shop up in Ar-Kansas) for all your Ford transmission needs for anyone in the market. Custom builds it to your specific application.
ETA: can’t recommend the builder enough (Brian’s Truck Shop up in Ar-Kansas) for all your Ford transmission needs for anyone in the market. Custom builds it to your specific application.
This post was edited on 7/25/26 at 4:09 pm
Posted on 7/25/26 at 4:56 pm to Soul Gleaux
Why put that on a 6 axle.
Posted on 7/25/26 at 8:55 pm to Soul Gleaux
Soul Gleaux what kind of swap u did?
Posted on 7/25/26 at 9:47 pm to LSUDUCKMAN67
300 six cylinder to moderately built 460 in an obs F150. Upgraded the tranny and swapped in a Dana 60 front, Sterling 10.5 rear.
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