Drive shaft crooked after swap - Pirate4x4.Com : 4x4 and Off-Road Forum

Doc Johnson · 10-02-2002, 06:17 AM

Well I did an engine swap this weekend and after I mounted the tranny the rear drive shaft is obout 1/2 to 1 inch off front he rear end. I have no Idea why I guess something moved when I went to drill out the skid plate or I just fawked up my measurements. It is a suttle missalignment and I was hopeing it would be okay? What do you boys think??

Jakesteramalamajama · 10-02-2002, 06:29 AM

If you have a CV shaft (and if it runs smooth), I wouldn't sweat it. If you get vibes, fix it or you'll just eat joints.

4Bangler · 10-02-2002, 06:35 AM

Your trans mounts could be in the right place and still have teh rear output offset, did you offset your motor at least 1" to the passenger side? If you centered the motor, your rear yoke will be offset farther to the passenger side. I see a lot of engine swaps where the owner was too concerned with the motor being centered in the chassis to realize that it really should be offset, like the factory does it.

Jakesteramalamajama · 10-02-2002, 06:51 AM

Quote:

Originally posted by 4Bangler
I see a lot of engine swaps where the owner was too concerned with the motor being centered in the chassis to realize that it really should be offset, like the factory does it.

Yeah. I know a YJ engine should be offset an inch toward the passenger side. Not sure about the TJ but it seems likely...

4Bangler · 10-02-2002, 06:58 AM

If the front diff is on the driver's side, offset the drivetrain to the passenger side, if you're running passenger diff, offset to the driver's side. I've also seen swaps on YJ's where they offset the motor to the passenger side like the book said, but they were running passenger drop diffs and wondered why they were breaking starters with the front driveshaft.

Doc Johnson · 10-02-2002, 07:21 AM

The motor mounts are with in a 16th of an inch and offset one inch to the passanger side. Remarkably my stock driveshafts bolt right in with no mods to them. I set the engine as far back as possible for good weight distribution. I also seem to have more lift in the front than before!! After a test drive I will detremine wether or not I need to put in a CV drive shaft. I only got 2 1/2 inches of lift for now.

FULLSIZE · 10-05-2002, 09:01 PM

check to make sure the fan sits square with the radiator. might cause interference later.

10-02-2002, 06:17 AM	#1 (permalink)
Doc Johnson Banned Join Date: Aug 2002 Member # 13299 Location: Bloomington, IN Posts: 432	Drive shaft crooked after swap Well I did an engine swap this weekend and after I mounted the tranny the rear drive shaft is obout 1/2 to 1 inch off front he rear end. I have no Idea why I guess something moved when I went to drill out the skid plate or I just fawked up my measurements. It is a suttle missalignment and I was hopeing it would be okay? What do you boys think??

10-02-2002, 06:29 AM	#2 (permalink)
Jakesteramalamajama Registered User Join Date: Jun 2001 Member # 5577 Location: Nowhere Posts: 1,783	If you have a CV shaft (and if it runs smooth), I wouldn't sweat it. If you get vibes, fix it or you'll just eat joints. __________________ It's all here before your eyes / Safety is a big disguise / That hides among the other lies

10-02-2002, 06:35 AM	#3 (permalink)
4Bangler Jackstand Wheeler Join Date: Jun 2002 Member # 12152 Location: Alpena, Michigan Posts: 1,616	Your trans mounts could be in the right place and still have teh rear output offset, did you offset your motor at least 1" to the passenger side? If you centered the motor, your rear yoke will be offset farther to the passenger side. I see a lot of engine swaps where the owner was too concerned with the motor being centered in the chassis to realize that it really should be offset, like the factory does it. __________________ '46 CJ-2A, '47 CJ-2A, '48 CJ-2A, '50 M38, '52 M38A1, '62 CJ-3B, '62 CJ-5, '65 CJ-5, (2) '66 CJ-5's, '67 CJ-5, '69 CJ-5, '69 J-3000, '70 CJ-101, '74 DJ-5, '74 CJ-5, '77 CJ-5, '78 CJ-5, '78 CJ-7, '78 Wagoneer, '95 YJ, '97 XJ...None of them run.

10-02-2002, 06:58 AM	#5 (permalink)
4Bangler Jackstand Wheeler Join Date: Jun 2002 Member # 12152 Location: Alpena, Michigan Posts: 1,616	If the front diff is on the driver's side, offset the drivetrain to the passenger side, if you're running passenger diff, offset to the driver's side. I've also seen swaps on YJ's where they offset the motor to the passenger side like the book said, but they were running passenger drop diffs and wondered why they were breaking starters with the front driveshaft. __________________ '46 CJ-2A, '47 CJ-2A, '48 CJ-2A, '50 M38, '52 M38A1, '62 CJ-3B, '62 CJ-5, '65 CJ-5, (2) '66 CJ-5's, '67 CJ-5, '69 CJ-5, '69 J-3000, '70 CJ-101, '74 DJ-5, '74 CJ-5, '77 CJ-5, '78 CJ-5, '78 CJ-7, '78 Wagoneer, '95 YJ, '97 XJ...None of them run.

10-05-2002, 09:01 PM	#7 (permalink)
FULLSIZE Registered User Join Date: Mar 2001 Member # 3654 Location: Grass Valley, CA Posts: 4,462	check to make sure the fan sits square with the radiator. might cause interference later. __________________ A Dodge guy...yep, weirdo for sure.

10-02-2002, 07:21 AM	#6 (permalink)
Doc Johnson Banned Join Date: Aug 2002 Member # 13299 Location: Bloomington, IN Posts: 432	The motor mounts are with in a 16th of an inch and offset one inch to the passanger side. Remarkably my stock driveshafts bolt right in with no mods to them. I set the engine as far back as possible for good weight distribution. I also seem to have more lift in the front than before!! After a test drive I will detremine wether or not I need to put in a CV drive shaft. I only got 2 1/2 inches of lift for now.

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