I need a measurement off of a 4L80E - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skorpioskorpio · 08-31-2014, 05:39 PM

I know it's a longshot, but other forums where this question may be more appropriote are full of people nowhere near as helpfull as the members here. If anyone happens to have a 4L80E trans lying around I need the measurement from the engine flange to the flat area where the front pump assembly is. My trans guy finally got me my trans case with the bell housing cut off. He was supposed to make this measurement before he cut the bell housing off and figured that simply giving me the cut off piece (which he did with a plasma cutter) was good enough...it's not.

So if anyone happens to have a 4L80E, out of a vehicle, with no converter in it and can just lay a straight edge across the engine flange and measure to the flat area between the pan and the pump I'd help me alot.

hugger6933 · 08-31-2014, 08:56 PM

I have one but the converter is still in it and it is on hold after a guy came by the shop on Friday afternoon. Wouldn't it be the same as the 400? Just asking I would thought it would. Jim

skorpioskorpio · 08-31-2014, 09:14 PM

I don't know if a TH400 is the same or not, it's the measurement of the casting dimensions. I know they have the same roots, but then again I know the pumps are not the same.

c10seconds · 09-01-2014, 05:17 AM

I measure 7.5" from the small flat area to the enging flange. Flat area being one of the two corners just below the pump and right above the pan. I have a loose 4L80 in my garage so just let me know if you need a different measurement.

skorpioskorpio · 09-01-2014, 06:14 AM

Sounds like a description of the spot I was thinking of. Should be flat and the same measurement to the rim around the pump, correct? I need to machine my case front to that height and clean up the plasma cutter and grinder mess the trans guy did so I can mill an adapter plate for my 4L60E bellhousing and have it sit flush.

I really, really do appreciate the effort to get that for me, I hope members here know what a great community this board is. If I'd tried to ask this on some of the other boards out there I'd probably have gotten some BS response asking why I wrecked a trans or some such nonsense.

08-31-2014, 05:39 PM	#1
skorpioskorpio Registered User Join Date: Nov 2010 Location: Los Angeles, CA Posts: 1,018	I need a measurement off of a 4L80E I know it's a longshot, but other forums where this question may be more appropriote are full of people nowhere near as helpfull as the members here. If anyone happens to have a 4L80E trans lying around I need the measurement from the engine flange to the flat area where the front pump assembly is. My trans guy finally got me my trans case with the bell housing cut off. He was supposed to make this measurement before he cut the bell housing off and figured that simply giving me the cut off piece (which he did with a plasma cutter) was good enough...it's not. So if anyone happens to have a 4L80E, out of a vehicle, with no converter in it and can just lay a straight edge across the engine flange and measure to the flat area between the pan and the pump I'd help me alot.

08-31-2014, 08:56 PM	#2
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,262	Re: I need a measurement off of a 4L80E I have one but the converter is still in it and it is on hold after a guy came by the shop on Friday afternoon. Wouldn't it be the same as the 400? Just asking I would thought it would. Jim

08-31-2014, 09:14 PM	#3
skorpioskorpio Registered User Join Date: Nov 2010 Location: Los Angeles, CA Posts: 1,018	Re: I need a measurement off of a 4L80E I don't know if a TH400 is the same or not, it's the measurement of the casting dimensions. I know they have the same roots, but then again I know the pumps are not the same.

09-01-2014, 05:17 AM	#4
c10seconds Registered User Join Date: Oct 2009 Location: gilbert,AZ Posts: 947	Re: I need a measurement off of a 4L80E I measure 7.5" from the small flat area to the enging flange. Flat area being one of the two corners just below the pump and right above the pan. I have a loose 4L80 in my garage so just let me know if you need a different measurement. __________________ 1967 C10 SWB 6.8L/4L80

09-01-2014, 06:14 AM	#5
skorpioskorpio Registered User Join Date: Nov 2010 Location: Los Angeles, CA Posts: 1,018	Re: I need a measurement off of a 4L80E Sounds like a description of the spot I was thinking of. Should be flat and the same measurement to the rim around the pump, correct? I need to machine my case front to that height and clean up the plasma cutter and grinder mess the trans guy did so I can mill an adapter plate for my 4L60E bellhousing and have it sit flush. I really, really do appreciate the effort to get that for me, I hope members here know what a great community this board is. If I'd tried to ask this on some of the other boards out there I'd probably have gotten some BS response asking why I wrecked a trans or some such nonsense.



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