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68 Suburban · 03-08-2004, 07:29 PM

My underdrive unit showed up today. Now I have to figure out if I really am going to go through with this

I have my hands full with getting the burb ready for paint.

It looks pretty straight forward, besides shortening or getting a new driveshaft.

If I do deside to install it, I would like to do it before I take my 4 week cross country trip in May. Sure will help tow my travel trailer up those mountains. It will turn that 3.08 into a 3.85 ratio when I need it.

What to do, what to do......

71402BB · 03-08-2004, 08:09 PM

Sweet. Let us know how it goes! you could always have the driveshaft cut to lenght! Oh and thanks for your help once again on the other post! -Brian

meathead95 · 03-08-2004, 08:18 PM

use it. what would be better than having a tow/haul mode on the good old burb.

*rage'nrat638* · 03-08-2004, 08:35 PM

MAN WE KNOW WHO'S GOT ALL THE MONEY NOW

SWEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEET

68 Suburban · 03-08-2004, 10:16 PM

Quote:

Originally posted by rage'nrat638
MAN WE KNOW WHO'S GOT ALL THE MONEY NOW

nah, just a smart shopper

Blue Beard · 03-08-2004, 11:30 PM

Save it for next winters project or send it to me.........

krazy_texan · 03-09-2004, 02:36 AM

never heard of one fill me in guys

68 Suburban · 03-09-2004, 03:05 AM

Quote:

Originally posted by krazy_texan
never heard of one fill me in guys

It would be the same idea as a truck with a 2 speed rear end. You have a total of 6 speeds that could be used. You obviously would not use all of them, but they are there.

shortymac83 · 03-09-2004, 05:27 AM

I know I'd use all of them!

Krazy, it works like an overdrive for all 3 (or 4) gears, so you've got 1st, 1st with OD, 2nd, 2nd with OD, 3rd, 3rd with OD, etc.

toms68cst · 03-09-2004, 10:13 AM

Dumb questions(s).....

Does that go right off your transmission kinda like a xfer case? Won't that put a lot of extra torque on your drive shaft?

It must shift with a solenoid? (Electrically?)

Looks like a pretty cool thing.

boraxman · 03-09-2004, 11:38 AM

How much do they cost?

71402BB · 03-09-2004, 11:54 AM

Shortymac83- your right except, it's an underdrive not an overdrive. It's like Low first gear, first, Low 2nd gear, 2nd, Low 3rd gear, 3rd ect.

Ya I've been wanting somthing simalier, but I want OD instead of underdrive, because I allready have the tall gears! What I'm really wanting is the factory OD unit!

rambler · 03-09-2004, 12:26 PM

I was thinking about one for my truck to help with MPG,, where do you find one, (vehicle?) can you put on in a automatic as well? I"ve also got the old 4 speed in my 67 with granny, would be great for hyway travel

68 Suburban · 03-09-2004, 01:35 PM

Quote:

Originally posted by boraxman
How much do they cost?

New they cost about $2400. If you shop around, you can find a used one for quite a bit less.

68 Suburban · 03-09-2004, 01:39 PM

Quote:

Originally posted by rambler
I was thinking about one for my truck to help with MPG,, where do you find one, (vehicle?) can you put on in a automatic as well? I"ve also got the old 4 speed in my 67 with granny, would be great for hyway travel

This one is setup for a turbo 400. It will take the place of tail cone on the trans. There are different tail cones that can be exchanged so it can be used with other transmission. This is an UNDERDRIVE unit, so it is the opposite of an overdrive unit. I already have 3.08 gears and get close to 20 mpg, so an overdrive unit would not really help me that much. This is to help me while I am pulling. It would be the same as me having 3.85 gears to pull, and the 3.08 gear to cruise.

rambler · 03-09-2004, 02:03 PM

LOL, Now it makes sense,, I wish I was getting 20 MPG on my 72,, no where near.. so a overdrive would help me out.. something to put on my list..

68 Suburban · 03-09-2004, 02:15 PM

Quote:

Originally posted by rambler
LOL, Now it makes sense,, I wish I was getting 20 MPG on my 72,, no where near.. so a overdrive would help me out.. something to put on my list..

When I first got my burb about 4 years ago, I was gettinga bout 10 mpg. It has been like a game to see how I can increase the mpg

My latest change was to put a 50,000 volt coil and gap the plugs at 60. It was only a week ago, but it seems like I have picked up abut 1.5 mpg.

03-08-2004, 07:29 PM	#1
68 Suburban Registered User Join Date: Oct 2000 Location: From Chicago, Live in Phoenix, AZ Posts: 6,802	Its here, now do I have the guts to do it...lol My underdrive unit showed up today. Now I have to figure out if I really am going to go through with this I have my hands full with getting the burb ready for paint. It looks pretty straight forward, besides shortening or getting a new driveshaft. If I do deside to install it, I would like to do it before I take my 4 week cross country trip in May. Sure will help tow my travel trailer up those mountains. It will turn that 3.08 into a 3.85 ratio when I need it. What to do, what to do...... __________________ Just sitting here contemplating contemplation.

03-08-2004, 08:09 PM	#2
71402BB now thats a true COON DOG Join Date: Nov 2000 Location: Franconia, NH Posts: 1,977	Sweet. Let us know how it goes! you could always have the driveshaft cut to lenght! Oh and thanks for your help once again on the other post! -Brian __________________ current project 67 402BB stout th350 3.08's with a locker. Plan on tubs 18.5's out back! (thanks Burnsman!) 71 SWB Stepside, was a 250, now is a 402 Big Block with 4 speed and 3.73's ( was crushed by a tree, bed sold, motor pulled) was my first truck!... oh well... 72 LWB 4x4 350 4-speed 3.08's posi wearing army olive drab green (SOLD!) 68 BURB 50TH LOOKALIKE work in progress, soon to have 250-I6 with a 3-speed on the tree 4.11's and posi ( currently sitting in back yard tarped awaiting time, $$$, and lots of love!) 67 1 TON- work truck 396 sm 420 4-speed, flat bed 4.57 gears "big red" (my first landscape truck, very rusty and crusty! but still gets the job done when needed!)

03-08-2004, 08:18 PM	#3
meathead95 computer illiterate Join Date: Jan 2001 Location: Des Moines, IA Posts: 6,446	use it. what would be better than having a tow/haul mode on the good old burb. __________________ 72 2wd blazer 72 swb 4x4

03-08-2004, 11:30 PM	#6
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,834	Save it for next winters project or send it to me......... __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

03-09-2004, 02:36 AM	#7
krazy_texan Registered User Join Date: Oct 2002 Location: West Des Moines, Ia Posts: 3,233	never heard of one fill me in guys __________________ Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO

03-08-2004, 08:35 PM	#4
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	MAN WE KNOW WHO'S GOT ALL THE MONEY NOW SWEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEET

03-09-2004, 05:27 AM	#9
shortymac83 hmm... Join Date: Jan 2004 Location: Culver, Indiana Posts: 1,631	I know I'd use all of them! Krazy, it works like an overdrive for all 3 (or 4) gears, so you've got 1st, 1st with OD, 2nd, 2nd with OD, 3rd, 3rd with OD, etc. __________________ 1983 Oldsmobile Delta 88 1967 Chevy C-10 stripper www.fcrperformance.com - wanna go...faster? talk to FCR.

03-09-2004, 10:13 AM	#10
toms68cst Registered User Join Date: Jun 2000 Location: Bismarck, ND Posts: 4,286	Dumb questions(s)..... Does that go right off your transmission kinda like a xfer case? Won't that put a lot of extra torque on your drive shaft? It must shift with a solenoid? (Electrically?) Looks like a pretty cool thing. __________________ Unrestored 68 C-10 CST. Original 327. 4-Speed CH465. 50k or so miles. TREASURER, Drum Brake Club.

03-09-2004, 11:38 AM	#11
boraxman Keepin an eye out Join Date: Feb 2003 Location: So.Cal Posts: 3,921	How much do they cost? __________________ 1970 Chevy C10 SWB 5.3 1996 Toyota Tacoma SR5 4x4 2007 Vespa GTS 250 Scooter ZIP 91351

03-09-2004, 11:54 AM	#12
71402BB now thats a true COON DOG Join Date: Nov 2000 Location: Franconia, NH Posts: 1,977	Shortymac83- your right except, it's an underdrive not an overdrive. It's like Low first gear, first, Low 2nd gear, 2nd, Low 3rd gear, 3rd ect. Ya I've been wanting somthing simalier, but I want OD instead of underdrive, because I allready have the tall gears! What I'm really wanting is the factory OD unit! __________________ current project 67 402BB stout th350 3.08's with a locker. Plan on tubs 18.5's out back! (thanks Burnsman!) 71 SWB Stepside, was a 250, now is a 402 Big Block with 4 speed and 3.73's ( was crushed by a tree, bed sold, motor pulled) was my first truck!... oh well... 72 LWB 4x4 350 4-speed 3.08's posi wearing army olive drab green (SOLD!) 68 BURB 50TH LOOKALIKE work in progress, soon to have 250-I6 with a 3-speed on the tree 4.11's and posi ( currently sitting in back yard tarped awaiting time, $$$, and lots of love!) 67 1 TON- work truck 396 sm 420 4-speed, flat bed 4.57 gears "big red" (my first landscape truck, very rusty and crusty! but still gets the job done when needed!)

03-09-2004, 12:26 PM	#13
rambler MOVE OVER Join Date: Jun 2002 Location: Warrensburg, MO Posts: 5,470	I was thinking about one for my truck to help with MPG,, where do you find one, (vehicle?) can you put on in a automatic as well? I"ve also got the old 4 speed in my 67 with granny, would be great for hyway travel __________________ No matter where you are..... There you are... Buckaroo Banzi

03-09-2004, 02:03 PM	#16
rambler MOVE OVER Join Date: Jun 2002 Location: Warrensburg, MO Posts: 5,470	LOL, Now it makes sense,, I wish I was getting 20 MPG on my 72,, no where near.. so a overdrive would help me out.. something to put on my list.. __________________ No matter where you are..... There you are... Buckaroo Banzi



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