excessive engine angle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

J3rm0ff · 05-01-2018, 07:25 AM

What’s everyone doing about the engine/trans angle? I have an lq4 and 4l80e.

I am using the stock trans crossmember. I have the 73+ c20 engine stands and my angle was about 6.5 degrees when the frame is set level. I had about 1.25” between the oil pan and crossmember.

I remembered a discussion about the 73+ c10 mounts so I got those and installed them. I also put 1/2” spacers at the trans mount. I’m at 4.5 degrees. Now the Oil pan is about 1/8” from the crossmember..

Is 4.5 to 5 degrees going to be ok? My truck is a 2 piece drive shaft if that changes anything.

BR3W CITY · 05-01-2018, 02:52 PM

I don't see an issue with it. As long as you can get your rear end the appropriate corresponding angle, the driveline will be happy.

sprint_9 · 05-01-2018, 06:21 PM

I think mine is around 5 degrees.

thehata1 · 05-01-2018, 08:01 PM

I just pulled my stock motor and trans this past weekend and the trans yoke was at 5 degrees. Planning to put the 4L80 and the same.

**mongocanfly** · 05-01-2018, 08:01 PM

yeah ..not terrible.. like brew said, as long as your rear diff angle matches your engine/trans angle it be all good...just imagine them running as 2 imaginary parallel lines...I always like posting this vid whenever a driveline angle question comes up....https://www.youtube.com/watch?v=Idk3BVDVHq4

J3rm0ff · 05-02-2018, 09:27 AM

Thanks for the feedback. Makes me feel better. I will get the engine at the least angle possible and adjust the carrier bearing and rear diff as necessary.

davepl · 05-02-2018, 10:39 AM

As long as the rear end is the mirror image angle, should be OK as long as lubrication isn't compromised by the angle, and I can't imagine 5 degrees would cause a problem.

J3rm0ff · 05-02-2018, 04:08 PM

Quote:

Originally Posted by davepl

As long as the rear end is the mirror image angle, should be OK as long as lubrication isn't compromised by the angle, and I can't imagine 5 degrees would cause a problem.

Does the same apply to a 2 piece driveshaft?

homemade87 · 05-03-2018, 06:44 AM

I dont think you could get and ls engine in a vehicle at such and extreme angle and make it fit into the vehicle to be a problem . Just make sure its proper to your drive shaft . This is more important to the drive train .

davepl · 05-03-2018, 10:28 AM

Quote:

Originally Posted by J3rm0ff

Does the same apply to a 2 piece driveshaft?

OOohh, that's a good question, I don't know off the top of my head.

The problem is that for every u joint you need a second u joint with the OPPOSITE angle to "cancel" out the leverage of one. When one is at max leverage the other is opposite.

But with a two-piece driveshaft you just have that one in them middle, and I don't know how to deal with geometry on that one. I'll sit back and learn I guess!

**truckdude239** · 05-04-2018, 10:03 AM

i just stabed mine in and didnt set any angles i have a 2 pieces shaft no wierd vibarations or anything yet 2k miles in

crazy longhorn · 05-07-2018, 08:31 PM

On a 2pc shaft, you need to veiw the first shaft as an extension of the trans (pretty much), but give that 1st u joint off the trans about 1 degree, to work the grease into the joint. The last 2 joints should pretty much match up.....is it leaf or coil spring? On a leaf spring truck, you may want to have the pinion @ a slightly tipped down angle, as it will rock up on the throttle. dont ask, how I learned this! I have a neighbor, with a 67 camaro BB/4 spd, he runs "broke back" angles, a 1 pc shaft....in other words, the trans is 3 degrees down to the rear, & the pinion is 3 degrees down to the front. It cruises fine like that, & under a hard wrap on the springs, it handles the 1/4 mile just fine! Fruit for thought? Longhorn

05-01-2018, 07:25 AM	#1
J3rm0ff Registered User Join Date: Nov 2017 Location: Canton ohio Posts: 269	excessive engine angle What’s everyone doing about the engine/trans angle? I have an lq4 and 4l80e. I am using the stock trans crossmember. I have the 73+ c20 engine stands and my angle was about 6.5 degrees when the frame is set level. I had about 1.25” between the oil pan and crossmember. I remembered a discussion about the 73+ c10 mounts so I got those and installed them. I also put 1/2” spacers at the trans mount. I’m at 4.5 degrees. Now the Oil pan is about 1/8” from the crossmember.. Is 4.5 to 5 degrees going to be ok? My truck is a 2 piece drive shaft if that changes anything. Attached Images

05-01-2018, 02:52 PM	#2
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: excessive engine angle I don't see an issue with it. As long as you can get your rear end the appropriate corresponding angle, the driveline will be happy. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

05-01-2018, 06:21 PM	#3
sprint_9 Registered User Join Date: Nov 2012 Location: 9 Posts: 862	Re: excessive engine angle I think mine is around 5 degrees.

05-01-2018, 08:01 PM	#4
thehata1 Registered User Join Date: Dec 2017 Location: Mile High Posts: 160	Re: excessive engine angle I just pulled my stock motor and trans this past weekend and the trans yoke was at 5 degrees. Planning to put the 4L80 and the same.

05-01-2018, 08:01 PM	#5
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,601	Re: excessive engine angle yeah ..not terrible.. like brew said, as long as your rear diff angle matches your engine/trans angle it be all good...just imagine them running as 2 imaginary parallel lines...I always like posting this vid whenever a driveline angle question comes up....https://www.youtube.com/watch?v=Idk3BVDVHq4 __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

05-02-2018, 09:27 AM	#6
J3rm0ff Registered User Join Date: Nov 2017 Location: Canton ohio Posts: 269	Re: excessive engine angle Thanks for the feedback. Makes me feel better. I will get the engine at the least angle possible and adjust the carrier bearing and rear diff as necessary.

05-02-2018, 10:39 AM	#7
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: excessive engine angle As long as the rear end is the mirror image angle, should be OK as long as lubrication isn't compromised by the angle, and I can't imagine 5 degrees would cause a problem. __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

05-03-2018, 06:44 AM	#9
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: excessive engine angle I dont think you could get and ls engine in a vehicle at such and extreme angle and make it fit into the vehicle to be a problem . Just make sure its proper to your drive shaft . This is more important to the drive train .

05-04-2018, 10:03 AM	#11
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,220	Re: excessive engine angle i just stabed mine in and didnt set any angles i have a 2 pieces shaft no wierd vibarations or anything yet 2k miles in __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

05-07-2018, 08:31 PM	#12
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	Re: excessive engine angle On a 2pc shaft, you need to veiw the first shaft as an extension of the trans (pretty much), but give that 1st u joint off the trans about 1 degree, to work the grease into the joint. The last 2 joints should pretty much match up.....is it leaf or coil spring? On a leaf spring truck, you may want to have the pinion @ a slightly tipped down angle, as it will rock up on the throttle. dont ask, how I learned this! I have a neighbor, with a 67 camaro BB/4 spd, he runs "broke back" angles, a 1 pc shaft....in other words, the trans is 3 degrees down to the rear, & the pinion is 3 degrees down to the front. It cruises fine like that, & under a hard wrap on the springs, it handles the 1/4 mile just fine! Fruit for thought? Longhorn __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....



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