Strange trans hump? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

russgt · 04-03-2011, 09:56 PM

I found this trans hump for sale and it has me confused. I know that the 4x4s and the 4 speeds had the removable humps, but why would a 2 wheel drive automatic?

http://milwaukee.craigslist.org/pts/2303215136.html

Longhorn Man · 04-03-2011, 09:57 PM

all big blocks with automatic got the high hump.

Liddy71 · 04-03-2011, 09:58 PM

a big block 2wd truck has a hump in it

70BLAZERX2 · 04-03-2011, 10:02 PM

These were put in to clear the TH400 tranny's behind the BB

I had a 70 with a 350/TH400 had the same hump in it.

russgt · 04-03-2011, 10:29 PM

AH, didn't know that, thanks guys!

AirSpeed · 04-03-2011, 10:35 PM

Dont all trucks have a removable hump? I have a 69 C10 w/auto and a 72 GMC 4X4 w/auto, both of them have removable trans hump. I also had a 70 GMC and a 71 Chevy, 1 manual the other auto and they had the removable trans hump. The autos except my 4X4 all had the small hump but they all come out by removing a few bolts. I thought they all did?
Posted via Mobile Device

treveiger · 04-03-2011, 10:42 PM

^^^^I think the lower humps didnt bolt out. If im wrong im sure somebody will correct me.

**too much stuff** · 04-03-2011, 10:49 PM

The low humps are part of the cab and not removeable. A Big block/th400, 4 speed truck, or 4x4 generally had the bolt in hump.

*stich626* · 04-03-2011, 10:51 PM

so a th400 doesn't fit a low hump

**70cst** · 04-03-2011, 10:53 PM

Quote:

Originally Posted by stich626

so a th400 doesn't fit a low hump

That is correct...I think.

AirSpeed · 04-03-2011, 10:58 PM

Quote:

Originally Posted by too much stuff

The low humps are part of the cab and not removeable. A Big block/th400, 4 speed truck, or 4x4 generally had the bolt in hump.

My 69 came with a small block and auto trans and the low hump bolted in, all my trucks came with removable humps, short or tall humps. Did they make different cab floors at different plants or something? I'm curious.
Posted via Mobile Device

**too much stuff** · 04-03-2011, 11:06 PM

Quote:

Originally Posted by AirSpeed

My 69 came with a small block and auto trans and the low hump bolted in, all my trucks came with removable humps, short or tall humps. Did they make different cab floors at different plants or something? I'm curious.
Posted via Mobile Device

Never made a bolt in low hump that i have seen. Your 69 probably had a TH400 behind it originally.

STOCKISH · 04-03-2011, 11:07 PM

No, there are NO removable low hump trans tunnels from the factory in any 67-72.

AirSpeed · 04-03-2011, 11:24 PM

I replaced the original TH350 in my 69 a few years ago and installed a four speed out of another truck I bought, my grandfather bought my truck new. Anyway, when I replaced the trans I had to simply unbolt my small hump and bolted in the tall hump out of the donor truck. I had the same removable low hump in my 71 C10, I unbolted it when I replaced the trans in it. I'm confused now.
Posted via Mobile Device

**too much stuff** · 04-03-2011, 11:27 PM

If they were bolted in, they were hi-humps.

AirSpeed · 04-04-2011, 12:02 AM

Quote:

Originally Posted by too much stuff

If they were bolted in, they were hi-humps.

I must have some unusual trucks then, when I pulled the TH350 in my 69, I had to unbolt the low hump because the four speed wouldn't with it, I had bought another truck so I could use all the parts like the clutch linkage, pedal, drive line and the taller hump. When I was done I remember bolting the low hump in the donor truck when I sold it. Either way, I guess I had a couple of oddball trucks because they definitely had removeable low humps.
Maybe someone put in aftermarket low trans humps in two of my trucks, I don't know, but I do know they were there.
I must have been lucky! Thanks.
Posted via Mobile Device

MistaGavin · 04-04-2011, 06:05 AM

What some people do if they need the extra clearance is cut out the small hump and bolt a high hump in.

Tx Firefighter · 04-04-2011, 06:17 AM

Quote:

Originally Posted by stich626

so a th400 doesn't fit a low hump

A turbo 400 fits under a low hump cab. It's just closer to the floor than a high hump cab will be. If you have nice cab mount bushings it will clear fine. Only if you try getting by with 40 year old saggy original mount bushings do you have interference issues.

sean1969c10 · 04-04-2011, 06:33 AM

Just as a side note, there are odd ball trucks out there - mine was a 307, 3 on the tree, 2 WD LWB and I have a bolt in high hump cab.

Catengtech · 04-04-2011, 07:46 AM

A th400 will bolt into a small hump truck with no mods, i did it with a big block and a 400th in my 69 short step.

ls1nova71 · 04-04-2011, 11:58 AM

Quote:

Originally Posted by AirSpeed

I must have some unusual trucks then, when I pulled the TH350 in my 69, I had to unbolt the low hump because the four speed wouldn't with it, I had bought another truck so I could use all the parts like the clutch linkage, pedal, drive line and the taller hump. When I was done I remember bolting the low hump in the donor truck when I sold it. Either way, I guess I had a couple of oddball trucks because they definitely had removeable low humps.
Maybe someone put in aftermarket low trans humps in two of my trucks, I don't know, but I do know they were there.
I must have been lucky! Thanks.
Posted via Mobile Device

Ok, I'm going to ask the question everybody is thinking to themselves, do you have any pics of this bolt in low hump? I've never even heard of such a thing.

Longhorn Man · 04-04-2011, 08:23 PM

the TH400 didn't dictate a high hump, that one always comes up and i always wonder where that info comes from. A th400 with a big block got the high hump, but a th400 on a small block or inline got the low hump

**special-K** · 04-05-2011, 08:13 AM

I had a C/30 350/TH400 with a low hump floor. I never saw any low hump that bolted from the factory. It would have been a great idea,if they did.

BTW,that automatic 2wd hump is a great deal.Did you snag it?

russgt · 04-06-2011, 09:44 PM

No, didn't get it. I have quite a few already, but had never seen one without holes in it.

**Joesjunk** · 04-06-2011, 09:54 PM

Quote:

Originally Posted by ls1nova71

ok, i'm going to ask the question everybody is thinking to themselves, do you have any pics of this bolt in low hump? I've never even heard of such a thing.

x2......

04-03-2011, 09:56 PM	#1
russgt Registered User Join Date: May 2008 Location: Waukesha, WI Posts: 904	Strange trans hump? I found this trans hump for sale and it has me confused. I know that the 4x4s and the 4 speeds had the removable humps, but why would a 2 wheel drive automatic? http://milwaukee.craigslist.org/pts/2303215136.html __________________ 70 stepside 76 blazer 86 Silverado 20 Max Trailering 6.2 Crew 71 Nova SS My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634

04-03-2011, 09:57 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Strange trans hump? all big blocks with automatic got the high hump.

04-03-2011, 09:58 PM	#3
Liddy71 Registered User Join Date: May 2010 Location: Kenova, WV Posts: 821	Re: Strange trans hump? a big block 2wd truck has a hump in it

04-03-2011, 10:02 PM	#4
70BLAZERX2 Registered User Join Date: Jan 2010 Location: GREENEVILLE TENNESSEE Posts: 1,310	Re: Strange trans hump? These were put in to clear the TH400 tranny's behind the BB I had a 70 with a 350/TH400 had the same hump in it.

04-03-2011, 10:29 PM	#5
russgt Registered User Join Date: May 2008 Location: Waukesha, WI Posts: 904	Re: Strange trans hump? AH, didn't know that, thanks guys! __________________ 70 stepside 76 blazer 86 Silverado 20 Max Trailering 6.2 Crew 71 Nova SS My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634

04-03-2011, 10:35 PM	#6
AirSpeed Registered User Join Date: Jul 2007 Location: Fall River California Posts: 2,026	Re: Strange trans hump? Dont all trucks have a removable hump? I have a 69 C10 w/auto and a 72 GMC 4X4 w/auto, both of them have removable trans hump. I also had a 70 GMC and a 71 Chevy, 1 manual the other auto and they had the removable trans hump. The autos except my 4X4 all had the small hump but they all come out by removing a few bolts. I thought they all did? Posted via Mobile Device

04-03-2011, 10:42 PM	#7
treveiger Senior Member Join Date: Jul 2010 Location: South Dakota Posts: 4,093	Re: Strange trans hump? ^^^^I think the lower humps didnt bolt out. If im wrong im sure somebody will correct me. __________________ 1969 Chevy c20(Miss Hackjob)

04-03-2011, 10:49 PM	#8
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,715	Re: Strange trans hump? The low humps are part of the cab and not removeable. A Big block/th400, 4 speed truck, or 4x4 generally had the bolt in hump. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

04-03-2011, 10:51 PM	#9
stich626 Account Suspended Join Date: Sep 2010 Location: hingham ma Posts: 1,721	Re: Strange trans hump? so a th400 doesn't fit a low hump

04-03-2011, 11:07 PM	#13
STOCKISH Formerly- 1972SuperCheyenne Join Date: Oct 2008 Location: Wake Forest NC Posts: 5,782	Re: Strange trans hump? No, there are NO removable low hump trans tunnels from the factory in any 67-72. __________________ --Josh My Build Thread:http://67-72chevytrucks.com/vboard/s...d.php?t=799218 A good crossthread is better than Loctite any day. Life is not about what you have, but who you have to share it with.

04-03-2011, 11:24 PM	#14
AirSpeed Registered User Join Date: Jul 2007 Location: Fall River California Posts: 2,026	Re: Strange trans hump? I replaced the original TH350 in my 69 a few years ago and installed a four speed out of another truck I bought, my grandfather bought my truck new. Anyway, when I replaced the trans I had to simply unbolt my small hump and bolted in the tall hump out of the donor truck. I had the same removable low hump in my 71 C10, I unbolted it when I replaced the trans in it. I'm confused now. Posted via Mobile Device

04-03-2011, 11:27 PM	#15
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,715	Re: Strange trans hump? If they were bolted in, they were hi-humps. __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

04-04-2011, 06:05 AM	#17
MistaGavin Registered User Join Date: Nov 2010 Location: Fairbanks Alaska Posts: 126	Re: Strange trans hump? What some people do if they need the extra clearance is cut out the small hump and bolt a high hump in. __________________ You're not old, it IS loud! 1970 CST-10 BB 400

04-04-2011, 06:33 AM	#19
sean1969c10 Registered User Join Date: Mar 2008 Location: Powhatan, Va. Posts: 376	Re: Strange trans hump? Just as a side note, there are odd ball trucks out there - mine was a 307, 3 on the tree, 2 WD LWB and I have a bolt in high hump cab.

04-04-2011, 07:46 AM	#20
Catengtech Registered User Join Date: Apr 2011 Location: Bogata Texas Posts: 6	Re: Strange trans hump? A th400 will bolt into a small hump truck with no mods, i did it with a big block and a 400th in my 69 short step.



Register or Log In To remove these advertisements.

04-04-2011, 08:23 PM	#22
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Strange trans hump? the TH400 didn't dictate a high hump, that one always comes up and i always wonder where that info comes from. A th400 with a big block got the high hump, but a th400 on a small block or inline got the low hump

04-05-2011, 08:13 AM	#23
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: Strange trans hump? I had a C/30 350/TH400 with a low hump floor. I never saw any low hump that bolted from the factory. It would have been a great idea,if they did. BTW,that automatic 2wd hump is a great deal.Did you snag it? __________________ "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 ~ Last edited by special-K; 04-05-2011 at 08:14 AM.

04-06-2011, 09:44 PM	#24
russgt Registered User Join Date: May 2008 Location: Waukesha, WI Posts: 904	Re: Strange trans hump? No, didn't get it. I have quite a few already, but had never seen one without holes in it. __________________ 70 stepside 76 blazer 86 Silverado 20 Max Trailering 6.2 Crew 71 Nova SS My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634

Register or Log In To remove these advertisements.