Auto Hump To Manual - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**88JRFAN** · 12-29-2007, 09:45 PM

Does Anybody Know If The Automatic Humps Bolt In Like The Manual Humps In 4x4s. Looking At Buying A Truck With An Automatic And Was Wandering If They Would Interchange. Would Rather Not Have To Hack The Floor.

JimKshortstep4x4 · 12-30-2007, 12:39 AM

The bolt in humps have the same bolt pattern so they will interchange. If your new project has a bolt in hump than it is a simple swap out.

Jim

**special-K** · 12-30-2007, 01:33 AM

Yeah,definately don`t hack it.You can either find what you need or find a trade.Figure alot of guys swap from manual to auto and would be glad to trade even up,I`d think.I don`t think one is worth more than the other.

Longhorn Man · 12-30-2007, 01:37 AM

small humps are part of the floor's metal, it does not bolt in.

jlaird · 12-30-2007, 06:47 AM

Quote:

Originally Posted by Longhorn Man

small humps are part of the floor's metal, it does not bolt in.

that's what I thought too...

**88JRFAN** · 12-30-2007, 09:41 AM

Quote:

Originally Posted by special-K

Yeah,definately don`t hack it.You can either find what you need or find a trade.Figure alot of guys swap from manual to auto and would be glad to trade even up,I`d think.I don`t think one is worth more than the other.

I WOULD THINK ABOUT A TRADE, IF SOMEONE HAD AN AC CAB THAT IS AS CLEAN AS THIS ONE. PART OF THE REASON FOR BUYING THIS TRUCK IS TO SAVE ME TIME ON BODY WORK. ALSO BEING A WELDER WOULD MAKE SWAPPING OUT HUMPS A LITTLE EASIER. THANKS FOR INPUT, DAREN

72 cheyenne pdx · 12-30-2007, 09:53 AM

I am uneducated with the different humps for auto and manuals, but if one is a bolt in and the other is a welded in/molded in with the floor, can't you use the the bolt in version as a template and cut out the welded/molded hump? Just wondering.

1969k10stepside · 12-30-2007, 10:13 AM

Yes you can,and I have done it.It's very easy.If the truck was a clean truck and didn't need body work,I'd go for cutting it out and use it.It will be hard to find another cab in that condition in most cases so use what you can.That's my thought.Not all automatics had the low hump floor,big blocks with autos had them,trucks with 4spds had them,2wd GMC V6s w/ autos (Thanks Andy),and 4wds auto or manual had high hump floors.

Longhorn Man · 12-30-2007, 10:15 AM

that is 100% correct. The only type of truck to add to that list would be a 2 wheel drive V-6/automatic GMC truck.

I would just cut it out and bolt on the high hump.

**88JRFAN** · 12-30-2007, 10:20 AM

It's A 4 Wheel Drive, I've Not Seen It In Person Yet, So It May Already Have The High Hump. I've Only Seen Pics. Thanks Daren

Eichorst69 · 12-30-2007, 10:27 AM

I just came in from outside to take a break from working on a "new" cab for my 69........it's 85 degrees in S. Fl. and about 85% humidity!!!!

I just got finished cutting out the low hump so I can use my old high hump. It was simple, the grooves are already there, just follow them with a resiprocating saw, it took about 15min. Once it's cut out it will be identical to the old cabs floor. You can even take the fastener strips off the bottom of the old floor and tack them to the new floor to hold down the high hump.

Rob

1969k10stepside · 12-30-2007, 10:30 AM

I went the quick way and used the torch...
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**88JRFAN** · 12-30-2007, 10:39 AM

Hey 1969k10stepside, I Take It That Cab Was Not On A 4 Wheel Drive Truck, Since You Had To Cut It Out. OH AND ROB, IT MUST BE NICE, IT'S PROBABLY IN THE LOW 30S HERE.

1969k10stepside · 12-30-2007, 10:43 AM

Correct,The original cab on my short K10 was rusted out along the windshield.The cab pictured was an a/c cab I got for free.It was out of a 2wd auto tranny truck so I had to cut the floor out.A low hump cab can go on a 4wd (Atleast with an auto) and the tranny/t-case not hit the floor.You would just need a hole for the shifter but I wanted it to look right so I cut it out and used the high hump.

teeitup · 12-30-2007, 11:07 AM

Not all BB had high humps, I've had 2 that I've parted that were low humps. All the rest of the BB's I've parted have had high humps. And I got a V6 with a Automaitc here right now with a low hump, it has a turbo 400 in it too. Sometimes the GM factory workers didn't put them together right.

Longhorn Man · 12-30-2007, 02:42 PM

I've only seen 2 of the V6 1/2 ton trucks, and they both had high humps in them... I've seen i think 3 automatic v 6 3/4 tons, and they had low humps.
It never made much sence to me, and I was never able to get any info on that here since 1/2 tons were fairly uncommon with the V6.
The big block trucks you found with low humps, were they by chance 3 speed manuals? I've seen a few on line (never in person) like that with low humps

AuggieStyle · 12-30-2007, 03:02 PM

Quote:

Originally Posted by Eichorst69

I just came in from outside to take a break from working on a "new" cab for my 69........it's 85 degrees in S. Fl. and about 85% humidity!!!!

I just got finished cutting out the low hump so I can use my old high hump. It was simple, the grooves are already there, just follow them with a resiprocating saw, it took about 15min. Once it's cut out it will be identical to the old cabs floor. You can even take the fastener strips off the bottom of the old floor and tack them to the new floor to hold down the high hump.

Rob

damn must be nice we were at 59 today and i thought that was nice. for the winter.

12-29-2007, 09:45 PM	#1
88JRFAN LET'S GO RACIN' Join Date: Oct 2007 Location: SALINA,KS Posts: 1,212	Auto Hump To Manual Does Anybody Know If The Automatic Humps Bolt In Like The Manual Humps In 4x4s. Looking At Buying A Truck With An Automatic And Was Wandering If They Would Interchange. Would Rather Not Have To Hack The Floor.

12-30-2007, 12:39 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Auto Hump To Manual The bolt in humps have the same bolt pattern so they will interchange. If your new project has a bolt in hump than it is a simple swap out. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

12-30-2007, 01:33 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Auto Hump To Manual Yeah,definately don`t hack it.You can either find what you need or find a trade.Figure alot of guys swap from manual to auto and would be glad to trade even up,I`d think.I don`t think one is worth more than the other. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

12-30-2007, 01:37 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Auto Hump To Manual small humps are part of the floor's metal, it does not bolt in.

12-30-2007, 09:53 AM	#7
72 cheyenne pdx Registered User Join Date: Nov 2006 Location: Portland Posts: 382	Re: Auto Hump To Manual I am uneducated with the different humps for auto and manuals, but if one is a bolt in and the other is a welded in/molded in with the floor, can't you use the the bolt in version as a template and cut out the welded/molded hump? Just wondering.

12-30-2007, 10:13 AM	#8
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,020	Re: Auto Hump To Manual Yes you can,and I have done it.It's very easy.If the truck was a clean truck and didn't need body work,I'd go for cutting it out and use it.It will be hard to find another cab in that condition in most cases so use what you can.That's my thought.Not all automatics had the low hump floor,big blocks with autos had them,trucks with 4spds had them,2wd GMC V6s w/ autos (Thanks Andy),and 4wds auto or manual had high hump floors. Last edited by 1969k10stepside; 12-30-2007 at 10:20 AM. Reason: added info

12-30-2007, 10:15 AM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Auto Hump To Manual that is 100% correct. The only type of truck to add to that list would be a 2 wheel drive V-6/automatic GMC truck. I would just cut it out and bolt on the high hump.

12-30-2007, 10:20 AM	#10
88JRFAN LET'S GO RACIN' Join Date: Oct 2007 Location: SALINA,KS Posts: 1,212	Re: Auto Hump To Manual It's A 4 Wheel Drive, I've Not Seen It In Person Yet, So It May Already Have The High Hump. I've Only Seen Pics. Thanks Daren __________________ Daren 04 Chevy Extend cab 2500HD 6.0 Liter 4x4 71 CHEVY 3/4 4X4 402 BB, th400/np205, dana44/eaton ho52 w/4:10-TOY Rip El Jay RIP BOBBO'S MOM

12-30-2007, 10:27 AM	#11
Eichorst69 Registered User Join Date: Jan 2007 Location: South Florida Posts: 158	Re: Auto Hump To Manual I just came in from outside to take a break from working on a "new" cab for my 69........it's 85 degrees in S. Fl. and about 85% humidity!!!! I just got finished cutting out the low hump so I can use my old high hump. It was simple, the grooves are already there, just follow them with a resiprocating saw, it took about 15min. Once it's cut out it will be identical to the old cabs floor. You can even take the fastener strips off the bottom of the old floor and tack them to the new floor to hold down the high hump. Rob

12-30-2007, 10:30 AM	#12
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,020	Re: Auto Hump To Manual I went the quick way and used the torch...

12-30-2007, 10:39 AM	#13
88JRFAN LET'S GO RACIN' Join Date: Oct 2007 Location: SALINA,KS Posts: 1,212	Re: Auto Hump To Manual Hey 1969k10stepside, I Take It That Cab Was Not On A 4 Wheel Drive Truck, Since You Had To Cut It Out. OH AND ROB, IT MUST BE NICE, IT'S PROBABLY IN THE LOW 30S HERE. __________________ Daren 04 Chevy Extend cab 2500HD 6.0 Liter 4x4 71 CHEVY 3/4 4X4 402 BB, th400/np205, dana44/eaton ho52 w/4:10-TOY Rip El Jay RIP BOBBO'S MOM Last edited by 88JRFAN; 12-30-2007 at 10:41 AM.

12-30-2007, 10:43 AM	#14
1969k10stepside Registered User Join Date: Mar 2006 Location: USA Posts: 21,020	Re: Auto Hump To Manual Correct,The original cab on my short K10 was rusted out along the windshield.The cab pictured was an a/c cab I got for free.It was out of a 2wd auto tranny truck so I had to cut the floor out.A low hump cab can go on a 4wd (Atleast with an auto) and the tranny/t-case not hit the floor.You would just need a hole for the shifter but I wanted it to look right so I cut it out and used the high hump. Last edited by 1969k10stepside; 12-30-2007 at 10:43 AM.

12-30-2007, 11:07 AM	#15
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,396	Re: Auto Hump To Manual Not all BB had high humps, I've had 2 that I've parted that were low humps. All the rest of the BB's I've parted have had high humps. And I got a V6 with a Automaitc here right now with a low hump, it has a turbo 400 in it too. Sometimes the GM factory workers didn't put them together right. __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

12-30-2007, 02:42 PM	#16
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Auto Hump To Manual I've only seen 2 of the V6 1/2 ton trucks, and they both had high humps in them... I've seen i think 3 automatic v 6 3/4 tons, and they had low humps. It never made much sence to me, and I was never able to get any info on that here since 1/2 tons were fairly uncommon with the V6. The big block trucks you found with low humps, were they by chance 3 speed manuals? I've seen a few on line (never in person) like that with low humps

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