can't downshift from 6th to 5th
 

my 99 ss just recently purchased will not downshift from sixth to fifth anymore. It worked fine when i bought it, i just installed a diablosport tune but i don't think that would have anything to do with it. It goes into fifth fine from fourth and has no problems in any other gear, i just can't go straight sixth to fifth. I have to go to fourth then to fifth, any help would be appreciated!

Sounds like synchro issue. My 99 SS had abn issue with 5-6 too. I had to have new syncros installed for the 5-6

should i worry about if it goes into gear fine, just can't downshift?

my car doesn't shift from 6th to 5th either. i took it o a tranny shop and they said it was normal for my tranny. its a safety stop so that you cant accidently throw it in neutral.

not all t56's are like that but i guess a lot of them are.

Yeah mine does the exact same thing

Never heard of some T56's doing that and others not. I've had two different tranny's and neither had a "lockout". The first one had issues downshifting into second, but upshifted just fine. I would think a synchro is going out.

There's no lock out on the T-56 for 6-5.

I was just ripping thru the gears earlier today and did a few drops to fifth to do some low speed passing 4th is reserved for some play and 3rd is the serious highway roll gear.

You have a syncro issue at the least.

Mine has no issues with the 6th-5th downshift either.

Whoever said its designed like that doesn't know their ass from a hole in the ground.

The only lock out a T-56 has is for 2 and 3 during skip shift and the reverse lockout. Something is WRONG with your transmission if 6-5 is not working. Could be keys, syncros won't know until it's taken apart.

I've seen alot of shift fork pad wear cause strange 5/6 issues before. You wont know untill you tear the trans apart & check it out. Something is obviously not right.

Ah shit I was hoping this was a common issue, looks like I have to take the trans apart when I get a chance. Thanks for clearing this issue up

well shit how much does getting it fixed cost?

Well while your there might as well rebuild it IMO. Heck even upgrade with billet keys bronze shift fork pads etc.....