1997 Chevy Suburban Issues with it tring to shift into 4 lo

Well it sounds like you may have a transfer case control module (tccm) problem. So do any of the lights for the 4wd light up? Have you check the 4wd fuses? Were any blown? Let me know what you can so we can do some testing. Can you have it scanned for the TCCM to get codes from the 4wd system to help figure out what might be wrong?

Ok the TCCM is located under the dash om the steeing column support bracket. Now what you can do is test this your self. Locate the orange wire or term number 13 and make a jumper wire and connect it between the orange wire and ground. Now turn the key on engine off and the 4wd lights should blink. If all the 4wd lights only blink once then there is no codes stored. Now if there is codes stored then the lights will blink them with 3 second delay's between codes. You just count the blinks. If it is a code 1 then it will blink once and wait 3 seconds and blink it again. Now if there is code 1 and 2 then it will blink once wait 3 seconds and then blink twice and will wait 3 seconds and repeat it. Once you have the codes (write them down). Once you are done then I would like you to clear the codes to do this you simply remove the t-case fuse 20 amp and wait 40 seconds to reinstall then after you reinstall the fuse turn the key on engine off 5 times codes will be cleared. Get back to me with the codes and we will see what the system can tell us. The t-case fuse should be in the under hood fuse box. Let me know what code or codes you find.

Ok is this a 1 ton? If so then is has a transfer case relay on the right firewall.

Well it seems that the transfer case module that is on the steering column bracket is bad. The T-case fuse 20amp is what powers the module that is all it does.