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Old 01-13-2011, 03:46 PM   #1
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Question NEW (to me) M1008 want to swap in 4l80e, questions...

I just bought fourbyken's M1008 and so far so good, except I'm NOT digg'n the 55mph top speed.

As such i wana do an overdrive mod to the vehicle.

SO.... what's the BEST way to do this without breaking the bank? I'm lean'n towards a 4l80e cause I like the idea of an automatic in a pick up BUT I see the compushift ECM is $1200 alone THEN i'd need to find a DECENT 4l80e, THEN have it all installed!!!

so it's look'n like it's a $3k swap by the time yer all said & done???

I'm NOT going to put a 700r4 in it, NOBODY says it'll hold up, the Gear Vendors seems even WORSE of an idea as it costs like $2500 and ONLY works for ya in 2wd AND always has the torque converter working overtime...

SO, what's yer best suggestion???

What am I look'n at to do a NV4500 manual swap? ...bout the same $$ wise as a 4l80e all said & done, or way cheaper??

I'm at a bit of a loss... lil help would be a HUGE step down the right path!

thx guys!!!

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Old 01-13-2011, 03:56 PM   #2
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Swap in 4.10 gears.

Or even 3.73, too.
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Old 01-13-2011, 04:01 PM   #3
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Who says a properly built 700r4 won't hold up? How much HP and Torque are you making?
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Old 01-13-2011, 04:06 PM
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I say keep the 4.56s and go to a 35" tire with a built 700r4
Way cheaper than a 4l80e or the nv4500 swaps and a complete bolt in.
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Old 01-13-2011, 04:43 PM
Posted in reply to sixb's post starting "I say keep the 4.56s and go to a 35"..."
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Old 01-13-2011, 04:56 PM
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Seriously a well built 700 will live no problem behind a 6.2.

If your still dead set you dont want one then the cheapest 4L80e route is to pull a harness and a trans from a 1993 auto 6.5 turbo truck. Its a needle in a haystack but that year was mechanical pump 6.5T with a 4L80e with a standalone factory harness and computer. And if you do find that needle you might as well grab that 6.5T also...
1994 SCSB c1500 11.25:1 5.3, Trick flow 205 GenX heads, s10 nv3500, 4.30 Tru Trac 8.5in 10b w/ 9in outers
Ext Cab S10 Truggy Tube frame, 4.3 TBI, RA dana 44 front, Ox ford 8.8 rear

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Old 01-13-2011, 05:08 PM   #7
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some basic info here. http://coloradok5.com/forums/showthr...highlight=4l80

2 wheel peel project: http://coloradok5.com/forums/showthread.php?t=296680
plow machine : http://coloradok5.com/forums/showthread.php?t=309865
project stubby crew cab : http://coloradok5.com/forums/showthread.php?t=245582
diy4x custom dash : http://coloradok5.com/forums/showthread.php?t=284383
snap-on tool box : http://coloradok5.com/forums/showthread.php?t=225524
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Old 01-13-2011, 09:07 PM
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My plans are to do the 3.73 ratio, it already has 33' tires and am STRONGLY concidering a banks turbo.

i just can't understand how a 1/2 ton trans (700r4) would hold up well in stock form behind a turbo 6.2, if i end up towing a goose neck or equopment trailor, unless it is a BUILT 700r4... and if you spend to build a built 700 why not get the 4l80e??

I'm a ford guy so I'm new to the GM side of the fence here, but I just don't wana save $$ on a swap just to have to replace a later cause I went cheaper... or would i really need to build up a 4l80e also?

just look'n to hear from some of you who have done a swap to an overdrive in yer rig and hear what you would do if you had to do it over etc

lol in short HELP!
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Old 01-13-2011, 09:40 PM
Posted in reply to Slickm1008's post starting "My plans are to do the 3.73 ratio, it..."
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My 6.2 blazer came from the factory with a 700 and it lasted 137000 miles. I had it rebuilt with upgraded parts for 1300.00 (including the new diesel TC) and it is going strong with 32's and 342 gears. Thats about as hard a combo on a tranny as it gets, high gears and my lead foot.
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Old 01-14-2011, 06:01 AM
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when i was debating going 4l80, i was gonna just put the trans in, with a manual valvebody, and manualy shift it through the gears. no ECU needed. be kind of annoying really, and all said and done, id rather have a five speed if im rowing the gears, as such ive decided to go with an NV4500. although for that 6.2, you could go the cheaper route and get an NV3550, there are several on here running the NV3500, and say its gear spacing is better for the diesel engine. and should be strong enough to run it just fine.
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