What would be causing gears to pop out. At first it was 3rd and 5th gears. I changed the clutch now it wont take 4th at all and 5th continues to pop out (must hold it in) 3rd doesn't pop anymore but grinds going in.

Hello. It seems the 'shift fork' is either 'misaligned' and/or 'bent' in 3rd, 4th, 5th and REVERSE. It's, also, possible those gears are 'stripped' on their shaft(s); making driving that truck, in those gears, impossible. Good luck and keep me informed; if you want to.

In the installation of a new clutch in most instances it is necessary to remove the gear lever from inside the vehicle . Check that you have the end of the gear lever actually situated in the groove that lines up all the shift rails as you may have placed the end outside the groove and can move only one rail. You have given no indication of a clutch problem at this stage so I am sure that is where the problem will be.

C heck that the cable for the gears has been securely tightened on the box as the cable case may be moving and not allowing selection of the gears

The problem is inside the box, could be a sliding sleeve and gear

sounds like the synchronizer in the transmission is worn.

the shift linkage may need to be adjusted a bit or the shift forks and engaged gears for 4th and 5th may have worn enough that they need to be inspected and fixed.

There is problem in the gearbox.The sincronizers for a first & second gear are on the same gearswitch.Need to change them.Forget about the clutch.

it could be the valve body sticking, or worn clutch plates in the 3 & 4th gear planetary drum, or 3rd &4th gear solenoid is bad

J1/S1 Found in: Integra XSI/RSI (DA6) Type: Cable 1st: 3.230 2nd: 2.105 3rd: 1.458 4th: 1.107 5th: 0.848 R: 3.000 FD: 4.400 Y1 Found in: CRX/Civic (optional LSD) Type: Cable 1st: 3.166 2nd: 2.052 3rd: 1.416 4th: 1.103 5th: 0.870 R: 3.000 FD: 4.266 YS1 Found in: Integra 92-93 XSI/RSI (DA6, DA9) Type: Cable 1st: 3.307 2nd: 2.105 3rd: 1.458 4th: 1.107 5th: 0.880 R: 3.000 FD: 4.400 S80 Found in: Integra Type R 98+ (LSD) Type: Hydraulic 1st: 3.230 2nd: 2.105 3rd: 1.458 4th: 1.034 5th: 0.787 R: 3.000 FD: 4.785 S80/Y80 Found in: JDM SiR-G (optional LSD) Type: Hydraulic 1st: 3.230 2nd: 1.900 3rd: 1.360 4th: 1.034 5th: 0.787 R: 3.000 FD: 4.400 Y21/Y80/S80/S4C Found in: JDM 96-97 Integra R(LSD) JDM Civic R [EK9](LSD) JDM Civic SiR [EK4, EG6] JDM CR-X DEL SOL SIR (EG2)(optional LSD) USDM DEL SOL VTEC (EG2)(OPTIONAL LSD) Type: Hydraulic 1st: 3.230 2nd: 2.105 3rd: 1.458 4th: 1.107 5th: 0.848 R: 3.000 FD: 4.400

check shift fork adjustment. make sure you bleed the slave cylinder.also check shift cable adjustment.