2008 H3 3.7 to 5.3 swap
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Junior Member
Joined: Sep 2018
Posts: 1
2008 H3 3.7 to 5.3 swap
Hi all, I have a 2008 H3 that the motor is blown in, and I’d really like to get it running again. Money is tight, and trading it isn’t an option. My dilemma is this- 3.7 engines are never in any pick and pull around me or available for anything less than out of my price range, but 5.3 engines are all over the yards. What I have not been able to find an answer to is other than changing the wiring harness and modifying some mounts, will the transmission and transfer case from the 3.7 be compatible with the 5.3? I really just can’t afford to do a whole new transmission. Any help at all would be greatly appreciated, and I’d love to hear that everything will just bolt right up.
Senior Member
Joined: May 2008
Posts: 221
From: Shrewsbury, MA
Hi all, I have a 2008 H3 that the motor is blown in, and I’d really like to get it running again. Money is tight, and trading it isn’t an option. My dilemma is this- 3.7 engines are never in any pick and pull around me or available for anything less than out of my price range, but 5.3 engines are all over the yards. What I have not been able to find an answer to is other than changing the wiring harness and modifying some mounts, will the transmission and transfer case from the 3.7 be compatible with the 5.3? I really just can’t afford to do a whole new transmission. Any help at all would be greatly appreciated, and I’d love to hear that everything will just bolt right up.
Senior Member
Joined: Sep 2012
Posts: 262
Dont do it if you cant afford it! Its not cheap.
best option considering H3 prices today, get a replacement engine, sell it, buy an Alpha.
if you have deep pockets, go ahead, but dont stop at a 5.3 (the only cost diff between a 5.3 swap and a 6.0 swap is the price of the block itself)
Even better option, get a replacement engine for the 3.7, sell it, buy an alpha, drop in a 6 litre, sell the 5.3. Your cost will be much much less.
Or buy a totalled H3 alpha and swap the engine/accessories/trans/exhaust/wiring/pcm.....
best option considering H3 prices today, get a replacement engine, sell it, buy an Alpha.
if you have deep pockets, go ahead, but dont stop at a 5.3 (the only cost diff between a 5.3 swap and a 6.0 swap is the price of the block itself)
Even better option, get a replacement engine for the 3.7, sell it, buy an alpha, drop in a 6 litre, sell the 5.3. Your cost will be much much less.
Or buy a totalled H3 alpha and swap the engine/accessories/trans/exhaust/wiring/pcm.....
Junior Member
Joined: Sep 2021
Posts: 1
Super Moderator
Joined: Jul 2007
Posts: 13,096
From: Boat Town USA MI
Welcome to HF.
You just dug up an OLD Thread to ask a question in response to a post from THREE YEARS AGO!!!!! Always LOOK before you post anything. READ: Old Threads/'Necro-Bumping'
If you want to find a used 3.7L, digging up OLD AZZED Threads here is not going to get it done.
You just dug up an OLD Thread to ask a question in response to a post from THREE YEARS AGO!!!!! Always LOOK before you post anything. READ: Old Threads/'Necro-Bumping'
If you want to find a used 3.7L, digging up OLD AZZED Threads here is not going to get it done.
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