The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 11-07-2018, 03:42 PM   #1
Thanos
Registered User
 
Thanos's Avatar
 
Join Date: Feb 2016
Location: Louisiana
Posts: 77
Question Cannot decide on trans, been a while

Last time I posted was a ways back its been a long trip and still working on the 72 along with many other projects.


So I have a 04+ 8.1 (without egr) going with Howell engine dev for comp.

My 72 has been converted to a 1 ton dually for towing/toy not a DD, I have a nv4500 in the mint or can go the route of a 4L80e. Truck has a th400 in it currently so I am looking for input on best transmission for tow/toy between the 2.

I don't think I will leave stock however 500ish+ torque is good enough for me off idle. I have read Dirtylarrys post and he seems to be a wizard at these 8.1L so I hope he chimes in. Money is not problem between the 2 transmissions and what ever one I run with will have a gear vendors.

Thanos is offline   Reply With Quote
Old 11-07-2018, 04:54 PM   #2
GASoline71
"I ain't nobody, dork."
 
GASoline71's Avatar
 
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,430
Re: Cannot decide on trans, been a while

4L80E, you won't need the GV unless you want more OD. The TH400 with a GV would be bomb-proof.

Gary
__________________
'cuz chicks dig scars...

My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

Quote:
Originally Posted by LONGHAIR View Post
I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
Quote:
Originally Posted by Marv D View Post
Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
GASoline71 is offline   Reply With Quote
Old 11-07-2018, 05:12 PM   #3
clay68c10
Senior Member
 
clay68c10's Avatar
 
Join Date: Aug 2004
Location: Centennial, CO
Posts: 1,882
Re: Cannot decide on trans, been a while

I vote NV4500, but I like to shift it myself.
Really you can’t go wrong either way.
__________________
68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17.
68 Cadillac Sedan de Ville
93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday...
02 E320
13 Tahoe LTZ
clay68c10 is offline   Reply With Quote
Old 11-07-2018, 06:12 PM   #4
LockDoc
The Original Thread Killer

 
LockDoc's Avatar
 
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 18,500
Re: Cannot decide on trans, been a while

Quote:
Originally Posted by Thanos View Post
Last time I posted was a ways back its been a long trip and still working on the 72 along with many other projects.


So I have a 04+ 8.1 (without egr) going with Howell engine dev for comp.

My 72 has been converted to a 1 ton dually for towing/toy not a DD, I have a nv4500 in the mint or can go the route of a 4L80e. Truck has a th400 in it currently so I am looking for input on best transmission for tow/toy between the 2.

I don't think I will leave stock however 500ish+ torque is good enough for me off idle. I have read Dirtylarrys post and he seems to be a wizard at these 8.1L so I hope he chimes in. Money is not problem between the 2 transmissions and what ever one I run with will have a gear vendors.


Here is how I installed the NV4500 in my '72 Dually:

http://67-72chevytrucks.com/vboard/s...d.php?t=673588

A really easy & cheap way to get a heavy duty manual 5 speed overdrive in your truck. You just need to pay attention to what year and vehicle the trans and bell housing are out of.....

You won't need the GV unit with this trans. I can pretty much run any speed I want on the interstate with or without the trailer.

LockDoc
__________________
Leon

Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles

Last edited by LockDoc; 11-07-2018 at 06:19 PM.
LockDoc is offline   Reply With Quote
Old 11-07-2018, 08:20 PM   #5
Thanos
Registered User
 
Thanos's Avatar
 
Join Date: Feb 2016
Location: Louisiana
Posts: 77
Re: Cannot decide on trans, been a while

I'm doing the GV for 3 reasons, 4 over for towing, double OD for when not towing. Already did the calculations for RPM and with the 8.1 with 4.11 it came out perfect.

3rd reason is just to have 9 forward gears total or 8 on the automatic

If I go nv I need to figure out the best flywheel for 12 inch clutch that will work well on the 8.1 (internally balanced) and the pedals. I checked with southbend and they don't have a better input shaft for the 10 spline it's only for cummins.
Thanos is offline   Reply With Quote
Old 11-07-2018, 09:40 PM   #6
snj8198
Registered User
 
snj8198's Avatar
 
Join Date: Feb 2007
Location: Star Valley, WY
Posts: 2,022
Re: Cannot decide on trans, been a while

Quote:
I checked with southbend and they don't have a better input shaft for the 10 spline it's only for cummins.
I doubt you'll need a larger input shaft with the 8.1L torque. I'm pushing over 600lb/ft through my stock NV4500 pulling over 10,000lbs with a 12" dual friction clutch. The NV's were rated for like 420ft/lbs or so but they really hold up well as long as a guy isn't hammering on it.
__________________
Steve
1971 GMC Longbox. Full Roller Stroker 489 w/ FiTech EFI, Chris Straub Cam/NV4500/205/D60/14B w. Grizzly Locker and 4.11's. 2" Lift on 33's
snj8198 is offline   Reply With Quote
Old 11-07-2018, 09:55 PM   #7
1972RedNeck
Registered User
 
1972RedNeck's Avatar
 
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,682
Re: Cannot decide on trans, been a while

Personally not the biggest fan of the NV4500 due to the 5th gear setup. That, and once you start pushing 800+ ft lbs of torque, 3rd gear can do a good job of shredding teeth. If you have an NV4500, I would use it, but if you have to buy a tranny, I would look into the Spicer 3053a. A fair bit stronger, much cheaper, and it will bolt to your engine if you source the right parts from a C60 or the like and allow you to run a bigger clutch.

Only downside is that O/D is only .85:1 vs the NV4500's .73:1, but that could actually be better with the Gear Vendors as then you would have 2 different overdrive ratios instead of two similar ones (i.e. more usable gears). Gear spacing is also wider (presuming you have a post '94 NV4500) which would be a plus so long as you have the Gear Vendors.
__________________
1966 F250 4X4 416
1972 K20 350 4 OTF
Quote:
Originally Posted by GASoline71 View Post
I once pulled an intake manifold for a cam swap... ended up with a full on drag car that ran in the 11's.
1972RedNeck is offline   Reply With Quote
Old 11-07-2018, 10:18 PM   #8
jocko
Senior Member
 
jocko's Avatar
 
Join Date: Oct 2009
Location: Burleson, TX
Posts: 12,899
Re: Cannot decide on trans, been a while

Since you're tossin in the 496, have you considered an Allison? That's what they came with (if ordered with an auto).
jocko is offline   Reply With Quote
Old 11-07-2018, 10:52 PM   #9
LockDoc
The Original Thread Killer

 
LockDoc's Avatar
 
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 18,500
Re: Cannot decide on trans, been a while

Quote:
Originally Posted by jocko View Post
Since you're tossin in the 496, have you considered an Allison? That's what they came with (if ordered with an auto).

That's what I have behind my 2003 8.1. I also have a Workhorse 8.1 with the Allison 2350 MH six-speed automatic with lock up bolted to it, out of a motor home.

LockDoc
__________________
Leon

Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles
LockDoc is offline   Reply With Quote
Old 11-08-2018, 11:00 AM   #10
Thanos
Registered User
 
Thanos's Avatar
 
Join Date: Feb 2016
Location: Louisiana
Posts: 77
Re: Cannot decide on trans, been a while

Quote:
Originally Posted by jocko View Post
Since you're tossin in the 496, have you considered an Allison? That's what they came with (if ordered with an auto).
Yea I don't want to cut out the floor and expand the truck body for it to fit, I have owned a Allison behind a 8.1 before it was very very strong however the parasitic loss was certainly noticeable between it and the 4l85e . I won't be towing anything large enough to warrant the Allison anyhow.

So looking at your thread there Doc.

https://www.advanceadapters.com/prod...llhousing-kit/

https://www.pricefalls.com/product/c...d=184105378733

still getting list together.

Last edited by Thanos; 11-08-2018 at 11:15 AM.
Thanos is offline   Reply With Quote
Old 11-08-2018, 02:50 PM   #11
LockDoc
The Original Thread Killer

 
LockDoc's Avatar
 
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 18,500
Re: Cannot decide on trans, been a while

Quote:
Originally Posted by Thanos View Post
Yea I don't want to cut out the floor and expand the truck body for it to fit, I have owned a Allison behind a 8.1 before it was very very strong however the parasitic loss was certainly noticeable between it and the 4l85e . I won't be towing anything large enough to warrant the Allison anyhow.

So looking at your thread there Doc.

https://www.advanceadapters.com/prod...llhousing-kit/

https://www.pricefalls.com/product/c...d=184105378733

still getting list together.

I used the stock '72 bell housing and all of the stock clutch parts for my install. All that trick stuff is too rich for my blood....

LockDoc
__________________
Leon

Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles
LockDoc is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 09:50 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com