Author Topic: 4l80e for 85 chevy 4x4  (Read 3804 times)

Offline Captkaos

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Re: 4l80e for 85 chevy 4x4
« Reply #15 on: February 17, 2017, 07:47:28 AM »
1991, 1 year only.

Offline hatzie

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Re: 4l80e for 85 chevy 4x4
« Reply #16 on: February 17, 2017, 07:57:24 AM »
The NP208C from a TH400 or SM465 transmission truck will mate up to the NP24x & NP26x extension housings on the 4L80E used in the T400 & T800 chassis trucks... 
The six bolts are not evenly spaced. One is offset to key the clocking position of the transfer case.  The LS powered GMT800 rigs are Left Hand Drop the 73-91 CK RV squares are Right Hand Drop so the clocking position will not work even if you are OK with just using four or five of the six bolts.  Advance Adapters, and I believe Novak, make clocking rings.  One or both probably have LHD to RHD correcting clocking rings or a custom transmission tail housing that will allow you to install the RHD case with all six bolts.

The TH350, TH700R4, & 4L60 have 27 spline output shafts.  The SM465, NV4500, and TH400 have 32 spline output shafts.  I believe the 4L60E is 32 spline as well unlike the non electronic 4L60.  If your NP208C came from one of the 27 spline transmissions you'll need a new input sleeve/gear.

JTR (Jags That Run) should have a VSS adapter that will allow you to keep your cable speedometer and still run the LS motor. 

Irish
Didn't some of the 1991 3/4 ton Suburbans come with the NP241 & 4L80E?  Scarce as hens teeth...
« Last Edit: February 23, 2017, 12:19:48 AM by hatzie »
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Offline lstoold

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Re: 4l80e for 85 chevy 4x4
« Reply #17 on: February 21, 2017, 03:28:58 AM »
Bad day for me can not find any 241 u pull ,and no engine 6.0 too .....i saw some 5.3 but i keep looking.

Offline hatzie

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Re: 4l80e for 85 chevy 4x4
« Reply #18 on: February 21, 2017, 10:56:29 AM »
The LQ4 6.0L LS has is 325HP.  The LQ9, if you can find one, makes 345hp.  They are also a high demand item.

You can get to 320HP with the 5.3L with almost no effort and the 4.8 can make decent HP.  Similar to the 283 vs 327 smallblocks.
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Offline Captkaos

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Re: 4l80e for 85 chevy 4x4
« Reply #19 on: February 22, 2017, 09:34:46 PM »
you might as well be looking for gold trying to find a 241 for a 73-87(91).
There is nothing wrong with any LS setup, from 4.8L, 5.3L or 6.0L.  All will make more power than the SBC that was in there as hatzie pointed out.