high hump low hump ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**70CHEVYBB** · 08-17-2015, 10:32 AM

my 86 was 3 on the tree and I wasn't sure if its a high or low hump. I think its low but need expert advice on that.

Thanks Wes

J Knight · 08-17-2015, 12:20 PM

Its a low hump.

**old Rusty C10** · 08-17-2015, 12:22 PM

yes low bump high humps are bolted on and are only on four wheel drive models ( unless you have a cab change or 2wd conversion on a 2wd )as it has a high hump

KrazyRay · 08-17-2015, 12:30 PM

Yes its a low hump. The 84 and up high humps are NOT bolt on.

Tom · 08-17-2015, 06:22 PM

Weird, I've been into 73-87's since I was a wee pup and I've never seen this talked about. Whats the point on a high hump? I've fit sm465's, th350's, 200-4R's, muncie M20's and 700R4's in the "small humps" so I don't understand the need?

Keith Seymore · 08-17-2015, 09:57 PM

Low hump is 2wd auto and column shifted manual (M62 and M64 Saginaws).

High hump is everything else: 4wd or floor shifted manuals (SM465 or MY6 New Process - even 2wd).

It's driven by the required clearance underneath. The requirements are much more conservative when you are accounting for the variation of building 1.5 million trucks vs building one truck.

K

nonstop · 08-17-2015, 10:18 PM

Stupid question, but why did they even make the variance then? Why not just make it all high jump?

jetmech85 · 08-20-2015, 02:38 AM

My guess would be if you don't need a high hump for the transmission then you get a little more leg room for the middle passenger.

Keith Seymore · 08-20-2015, 08:54 AM

Quote:

Originally Posted by jetmech85

My guess would be if you don't need a high hump for the transmission then you get a little more leg room for the middle passenger.

Agree. The program team must have thought it was worth the trade off in terms of carrying the extra part and build complexity.

K

willem445 · 08-20-2015, 09:04 AM

Quote:

Originally Posted by Keith Seymore

Agree. The program team must have thought it was worth the trade off in terms of carrying the extra part and build complexity.

K

So in my 75 manual C10, would it have a low hump that is welded in and then my 80 K20 would have a bolted in high bump? How hard would it be to cut out the small bump, and drill and thread holes to bolt in the high bump?

The reason I ask is because my 75 donor truck has a much nicer cab than my current 80 cab and Im thinking about swapping them.

Tom · 08-20-2015, 04:04 PM

Quote:

Originally Posted by Keith Seymore

Low hump is 2wd auto and column shifted manual (M62 and M64 Saginaws).

High hump is everything else: 4wd or floor shifted manuals (SM465 or MY6 New Process - even 2wd).

Ahhh I see. In that case my 78 is a high hump [factory 2wd/sm465/8pack leaf springs], and it is welded not bolted in. I've only had the sm465 and M20's in that truck. My 79 must have been small hump and that fit the th350 and 200-4R.

enaberif · 08-20-2015, 05:28 PM

Quote:

Originally Posted by willem445

So in my 75 manual C10, would it have a low hump that is welded in and then my 80 K20 would have a bolted in high bump? How hard would it be to cut out the small bump, and drill and thread holes to bolt in the high bump?

The reason I ask is because my 75 donor truck has a much nicer cab than my current 80 cab and Im thinking about swapping them.

Lay it down.. mark the holes.. drill and bolt.

wraprail · 08-23-2015, 07:07 AM

Some of my personal hump pictures for your enjoyment. Both doner were 4x4 automatic.
This one was a 74 C10 that I put a 5 speed into (Camaro T5) and required a high hump. This was a bolt in high hump. Simple sheet metal screw installation.

This is the high hump from my latest C10, frame Z 2.5" and 6 speed (camaro T56) that required the high hump. As you can see this one does not have the bolt in option.

willem445 · 08-24-2015, 07:09 PM

Quote:

Originally Posted by wraprail

Some of my personal hump pictures for your enjoyment. Both doner were 4x4 automatic.
This one was a 74 C10 that I put a 5 speed into (Camaro T5) and required a high hump. This was a bolt in high hump. Simple sheet metal screw installation.

This is the high hump from my latest C10, frame Z 2.5" and 6 speed (camaro T56) that required the high hump. As you can see this one does not have the bolt in option.

Cool! Thanks man!

bL.A.zer90045 · 11-05-2018, 10:30 AM

Would a high hump be required in a c10 for a 4.8/nv4500 I’m planning on installing?

**1957 Chief** · 11-05-2018, 03:21 PM

Ditto what wraprail said. I have a TR6060 in my 86. I had to cut the hump out of an 85 donor truck to put in mine.

And sorry, I dont know the answer to your question IR2, if you need a high hump for your trans.

Bubba

RADustin · 11-05-2018, 04:50 PM

made this a while back.

**Mathew21** · 11-05-2018, 10:45 PM

Quote:

Originally Posted by RADustin

made this a while back.

Nice, Thanks for sharing!

sweetk30 · 11-05-2018, 11:17 PM

i currently have a th400/np203 range box to offroad design doubler plate to np205 all under a stock 1987 c/r-10 2wd low hump floor sitting on a k30 frame with energy suspension body mounts and NO body lift .

the 3 shifter lever mounting bolt is dimpling the floor so i know where to open it up for the 3 shifter levers .

**1774btcrew** · 11-08-2018, 11:21 AM

Quote:

Originally Posted by KrazyRay

Yes its a low hump. The 84 and up high humps are NOT bolt on.

Ray is spot on!

**57NAPCO** · 11-11-2018, 09:54 AM

Quote:

Originally Posted by Keith Seymore

Low hump is 2wd auto and column shifted manual (M62 and M64 Saginaws).

High hump is everything else: 4wd or floor shifted manuals (SM465 or MY6 New Process - even 2wd).

It's driven by the required clearance underneath. The requirements are much more conservative when you are accounting for the variation of building 1.5 million trucks vs building one truck.

K

Thanks Keith

08-17-2015, 10:32 AM	#1
70CHEVYBB Senior Member Join Date: Feb 2012 Location: chillicothe, illinois Posts: 688	high hump low hump ?? my 86 was 3 on the tree and I wasn't sure if its a high or low hump. I think its low but need expert advice on that. Thanks Wes Attached Images

08-17-2015, 12:20 PM	#2
J Knight Registered User Join Date: Jun 2011 Location: Baytown TX Posts: 2,219	Re: high hump low hump ?? Its a low hump. __________________ John 82 Chevy Silverado 350ci/TH350

08-17-2015, 12:22 PM	#3
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,259	Re: high hump low hump ?? yes low bump high humps are bolted on and are only on four wheel drive models ( unless you have a cab change or 2wd conversion on a 2wd )as it has a high hump __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

08-17-2015, 12:30 PM	#4
KrazyRay Registered User Join Date: Jun 2009 Location: Oroville, CA Posts: 4,827	Re: high hump low hump ?? Yes its a low hump. The 84 and up high humps are NOT bolt on.

08-17-2015, 06:22 PM	#5
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,690	Re: high hump low hump ?? Weird, I've been into 73-87's since I was a wee pup and I've never seen this talked about. Whats the point on a high hump? I've fit sm465's, th350's, 200-4R's, muncie M20's and 700R4's in the "small humps" so I don't understand the need? __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

08-17-2015, 09:57 PM	#6
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,141	Re: high hump low hump ?? Low hump is 2wd auto and column shifted manual (M62 and M64 Saginaws). High hump is everything else: 4wd or floor shifted manuals (SM465 or MY6 New Process - even 2wd). It's driven by the required clearance underneath. The requirements are much more conservative when you are accounting for the variation of building 1.5 million trucks vs building one truck. K __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 08-17-2015 at 10:58 PM.

08-17-2015, 10:18 PM	#7
nonstop Registered User Join Date: Dec 2014 Location: Northern California Posts: 422	Re: high hump low hump ?? Stupid question, but why did they even make the variance then? Why not just make it all high jump?

08-20-2015, 02:38 AM	#8
jetmech85 Registered User Join Date: Sep 2014 Location: Texas Posts: 215	Re: high hump low hump ?? My guess would be if you don't need a high hump for the transmission then you get a little more leg room for the middle passenger.

08-23-2015, 07:07 AM	#13
wraprail Registered User Join Date: Sep 2010 Location: Lake Havasu City Arizona Posts: 863	Re: high hump low hump ?? Some of my personal hump pictures for your enjoyment. Both doner were 4x4 automatic. This one was a 74 C10 that I put a 5 speed into (Camaro T5) and required a high hump. This was a bolt in high hump. Simple sheet metal screw installation. This is the high hump from my latest C10, frame Z 2.5" and 6 speed (camaro T56) that required the high hump. As you can see this one does not have the bolt in option. __________________

11-05-2018, 10:30 AM	#15
bL.A.zer90045 Registered User Join Date: May 2012 Location: 90045 cali Posts: 565	Re: high hump low hump ?? Would a high hump be required in a c10 for a 4.8/nv4500 I’m planning on installing?

11-05-2018, 03:21 PM	#16
1957 Chief Proud Vet that loves the USA Join Date: Jun 2016 Location: Beebe, AR Posts: 458	Re: high hump low hump ?? Ditto what wraprail said. I have a TR6060 in my 86. I had to cut the hump out of an 85 donor truck to put in mine. And sorry, I dont know the answer to your question IR2, if you need a high hump for your trans. Bubba Attached Images

11-05-2018, 11:17 PM	#19
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: high hump low hump ?? i currently have a th400/np203 range box to offroad design doubler plate to np205 all under a stock 1987 c/r-10 2wd low hump floor sitting on a k30 frame with energy suspension body mounts and NO body lift . the 3 shifter lever mounting bolt is dimpling the floor so i know where to open it up for the 3 shifter levers . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.



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