Cummins In 72 Suspension Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

maschka · 08-27-2014, 11:44 AM

I have a 72 3/4 ton 4x4 that i am considering throwing a 4BT into. Ever swap I have seen looks to have a 4"ish suspension lift. I this pretty much mandatory? I would like to stay closer to the stock height. Thanks for the help.

**Dieselwrencher** · 08-27-2014, 07:15 PM

With stock height, the oil pan is going to be sitting on your front diff, or pretty darn close. The drive shaft will be all in the way too. A 2.5" lift might get it but the oil pan will still be way close.

ryanroo · 08-27-2014, 07:56 PM

Quote:

Originally Posted by Dieselwrencher

With stock height, the oil pan is going to be sitting on your front diff, or pretty darn close. The drive shaft will be all in the way too. A 2.5" lift might get it but the oil pan will still be way close.

well, i know of a truck that clears at lower than stock height... haha

but yes, a lift is generally required. if you want to push the engine back a ways it helps you get it lower, but as ryan said, with the GM front diff, the driveline is close. oil pan can be modified to help with that, but it is easier to lift it a touch. lifted 4 inches and these trucks are still comparable to todays OEM trucks in height.

Nott32 · 11-08-2014, 11:00 PM

Sorry to thread steal,does the 2wd need a lift? I have a 70 but just bought complete front crossmember with disc brakes from a 73

**Dieselwrencher** · 11-10-2014, 03:10 PM

Quote:

Originally Posted by Nott32

Sorry to thread steal,does the 2wd need a lift? I have a 70 but just bought complete front crossmember with disc brakes from a 73

No, a 2wd will be fine. There's plenty of room for the cross member. The rear sump of the oil pan may be close to the ground if you plan to lower it though.

**rgreathouse** · 11-10-2014, 07:41 PM

I have a 72 4x4 with a 6bt. Where my engine is sitting about the lowest I was able to get is a 4" lift using custom leafs from ORD. I wish I could have gone lower but it wouldn't be very usable because of oil pan to front diff clearance.

muffintop · 11-13-2014, 04:14 AM

this sucks. so how about wheeling? if i hit a big enough bump will the diff be pushed into the oil pan???

**Dieselwrencher** · 11-13-2014, 10:05 PM

Quote:

Originally Posted by muffintop

this sucks. so how about wheeling? if i hit a big enough bump will the diff be pushed into the oil pan???

Yes it can be.

08-27-2014, 11:44 AM	#1
maschka Registered User Join Date: Aug 2014 Location: Abilene Tx Posts: 8	Cummins In 72 Suspension Question I have a 72 3/4 ton 4x4 that i am considering throwing a 4BT into. Ever swap I have seen looks to have a 4"ish suspension lift. I this pretty much mandatory? I would like to stay closer to the stock height. Thanks for the help.

08-27-2014, 07:15 PM	#2
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,142	Re: Cummins In 72 Suspension Question With stock height, the oil pan is going to be sitting on your front diff, or pretty darn close. The drive shaft will be all in the way too. A 2.5" lift might get it but the oil pan will still be way close. __________________ Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project *Tired of spark plugs? Check this out.*

11-08-2014, 11:00 PM	#4
Nott32 Registered User Join Date: Jun 2014 Location: Zeroday, Ca Posts: 7	Re: Cummins In 72 Suspension Question Sorry to thread steal,does the 2wd need a lift? I have a 70 but just bought complete front crossmember with disc brakes from a 73

11-10-2014, 07:41 PM	#6
rgreathouse Registered User Join Date: Dec 2004 Location: jackson,ca Posts: 494	Re: Cummins In 72 Suspension Question I have a 72 4x4 with a 6bt. Where my engine is sitting about the lowest I was able to get is a 4" lift using custom leafs from ORD. I wish I could have gone lower but it wouldn't be very usable because of oil pan to front diff clearance. __________________ 1972 c10,2wd,long bed,250,4spd----> 1972 SWB Fleetside 4x4 12v Cummins build thread http://67-72chevytrucks.com/vboard/s...d.php?t=513791

11-13-2014, 04:14 AM	#7
muffintop Registered User Join Date: Nov 2013 Location: sedro woolley, washington Posts: 71	Re: Cummins In 72 Suspension Question this sucks. so how about wheeling? if i hit a big enough bump will the diff be pushed into the oil pan???

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