H2 known tranny problems?

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H2 known tranny problems?

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H2 known tranny problems? - 8/29/2008 3:32:22 PM

framedoctor

Posts: 5
Joined: 8/26/2008
Status: offline

Hi all,
I''''m a newbie here as I just bought my first Hummer. Mine is an ''03 that was a previous theft. My question is; the tranny is grenaded and before I replace/ rebuild it, are there any known issues with these that I should avoid? As I understand the transmission in this year is ''03 only and only found in the H2 and 1/2 ton 6.0L trucks.
I got a fair deal on it, but don''''t want to break the bank on the tranny in case there are other issues following. It starts and runs well but wont come out of park. I dropped the pan and found a pile of metal chunks. My guess is that one of the pieces found it''''s way into a hole and won''''t let the linkage move.
Thanks in advance,
David

< Message edited by framedoctor -- 8/29/2008 8:13:43 PM >

Post #: 1

RE: H2 known tranny problems? - 8/29/2008 7:25:07 PM

phazer42

Posts: 170
Joined: 4/29/2008
Status: offline

my suggestion is to get ahold of www.schramsauto.com and see if they have one.... and the trans in your truck is the same as the Escalade, which I believe is the 4L65E, the trans mated to the 6.0L in the pick-ups is the 4L80E which is different.... I don''t know if the 4L80E is the same physical housing as the 65, but if it is, I would go with te 80 as its a stronger trans.... Schrams sells lots of really good used GM parts, generally for a good price...

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(in reply to framedoctor)

Post #: 2

RE: H2 known tranny problems? - 8/29/2008 8:12:39 PM

framedoctor

Posts: 5
Joined: 8/26/2008
Status: offline

I forgot about the Escalade, I thought I was going to be limited to finding an SS or H2 tranny. I have used Schram''s in the past, I''ll definately give them a call. I was going to check Triplett also as they deliver to us. My biggest concern with buying used was getting 45 days into a 30 day warranty and back in the same boat that I am in now.

(in reply to phazer42)

Post #: 3

RE: H2 known tranny problems? - 8/30/2008 6:45:39 AM

calif phil

Posts: 73
Joined: 2/7/2008
Status: offline

My 03 radiator tranny cooler broke and took out my trans. I would suggest an external tranny cooler or an updated radiator.

(in reply to framedoctor)

Post #: 4

RE: H2 known tranny problems? - 8/30/2008 7:51:24 PM

framedoctor

Posts: 5
Joined: 8/26/2008
Status: offline

How would I know if I already have an updated radiator? My H2 has 68K on it already. Do they usually break at or by a certain milage?

(in reply to calif phil)

Post #: 5

RE: H2 known tranny problems? - 9/9/2008 11:28:00 AM

medihummer

Posts: 12
Joined: 9/7/2008
Status: offline

the 4L85 is not the same size as the 4L65 but you can swap them. The 4L85 is much stronger. It shifts better end there is less gap between first and second. go to transmissionscenter. com If you swap stay with the 1400 stall speed for the torque converter. A higher stall speed does not work well with the hummer and overheats the tranny. the car is too heavy for a higher stall speed

If you have a standard engine and 34" wheels you can also go with a reinforced 4L65. look at the same website

(in reply to framedoctor)

Post #: 6

RE: H2 known tranny problems? - 9/10/2008 2:47:27 AM

framedoctor

Posts: 5
Joined: 8/26/2008
Status: offline

I already have a used tranny, it may already be in the truck. I had expected to get it rebuilt but the guy doing it said it was nonrebuildable. The front gearset had broken and took the case with it. I didn''t want to leave it setting around his shop too long ( he didn''t want to let it outside) so I found a used one with 60k from LKQ. I paid another $200 and got a 12/12 warranty. I had asked the guy doing it if I could get a 4L85E in there and he said they are too different?
I am still going to check out that site though.

(in reply to medihummer)

Post #: 7

RE: H2 known tranny problems? - 10/4/2008 12:54:48 PM

medihummer

Posts: 12
Joined: 9/7/2008
Status: offline

I did the swap on mine
so it is doable. It is quite expensive but it works perfect

(in reply to framedoctor)

Post #: 8

RE: H2 known tranny problems? - 10/7/2008 6:23:15 AM

snyder788

Posts: 1
Joined: 10/7/2008
Status: offline

I also have an 03 H2 and it slips very bad from 2nd to 3rd under normal driving conditions ( will rev from about 3,000- up to 5,000) before shifting) it also seems to surge when it goes in to overdrive at around 55mph-60 mph. Does anyone have anny advise on how to fix without replacing the tranny?

(in reply to framedoctor)

Post #: 9

RE: H2 known tranny problems? - 10/14/2008 2:06:56 PM

medihummer

Posts: 12
Joined: 9/7/2008
Status: offline

that sounds pretty bad.
3rd gear on a 4l65 is the weakest
you can have your transmission revised with a more powerfull band and uprated valves. You can put in corvette valves. These ones compress the band harder and therefore can handle more power.
How is your transmission temp?
Does is rise very fast when it slips?

(in reply to snyder788)

Post #: 10